Future 9/11 hijacker Mohamed Atta leaves Hamburg for some time in late 1997 and early 1998, and he may go to militant training camps in Afghanistan, possibly with hijacker associate Ramzi bin al-Shibh. When Atta returns in the spring of 1998 he tells his roommate that he has been on another pilgrimage (hajj) to Mecca, although author Terry McDermott will later note, “He had been on hajj just 18 months earlier, and it would be unlikely for a student—even one so devout—to go twice so quickly or stay so long.” This is Atta’s longest absence since arriving in Hamburg, and there is no record of him spending any substantial portion of it at home in Cairo. According to McDermott, he leaves Hamburg “as he usually did over the winter holiday.” [McDermott, 2005, pp. 57] But according to the 9/11 Commission, the gap is in February-March 1998, “a period for which there is no evidence of his presence in Germany.” Atta’s friends hold a party for him on his return, which is unusual for a student who has just returned from home. After returning to Germany, Atta applies for a new passport, something he will also do after returning from Afghanistan in early 2000 (see Late 1999). [9/11 Commission, 7/24/2004, pp. 167] There are other unexplained absences from Hamburg by members of the same cell around this time (see Summer-Winter 1998). Although the 9/11 Commission, based on information obtained from detainees during interrogation, will say that Atta and his associates do not travel to Afghanistan and join al-Qaeda until late 1999, some commentators will disagree and say that this happens earlier. [McDermott, 2005, pp. 57] For example, McDermott will say of the cell members’ various disappearances in 1997-8, “Practically, there is only one place they likely would have gone—Afghanistan.” [9/11 Commission, 7/24/2004, pp. 166] Jane Corbin will say that “[t]he time that Mohamed Atta spent in Afghanistan in 1998 was a period of ambitious reach for Osama bin Laden.” [Corbin, 2003, pp. 142] Jason Burke will say that “[i]n early 1998, [Atta] is thought to have traveled to Afghanistan, probably to Khaldan camp.” [Burke, 2004, pp. 243] In mid-2002, Al Jazeera reporter Yosri Fouda will allegedly interview bin al-Shibh and 9/11 mastermind Khalid Shaikh Mohammed in Pakistan (see April, June, or August 2002). In a book he co-writes in 2003, he will claim that an al-Qaeda operative known only by a nickname Fouda gave him so he could call him something—Abu Bakr—helped set up the interview. At one point, Bakr allegedly told Fouda that he met Atta and bin al-Shibh at a training camp around this time, saying: “They came together. I did not know who they were.… Brother Ramzi was very active and very much into media, and brother Atta was very kind.” Bin al-Shibh disappears in Germany for several months in late 1997, and re-enters Germany on a new visa in December 1997. [Fouda and Fielding, 2003, pp. 124]
1998: Monitored Al-Qaeda Operative Zammar Probably Recruits 9/11 Hijacker Atta and Others in Hamburg Cell
Al-Qaeda operative Mohammed Haydar Zammar probably recruits future 9/11 hijacker Mohamed and other key members of the Hamburg cell into al-Qaeda this year. According to Time magazine, “US investigators believe [Zammar] may have persuaded Atta’s Islamic study group to offer its services to al-Qaeda around 1998.” Zammar was frequently seen by neighbors with Atta starting in 1997 (see 1997). [Time, 7/1/2002]
Zammar Being Monitored by US and German Intelligence – German intelligence began heavily monitoring Zammar in early 1997 and this continues until at least early 2000 (see March 1997-Early 2000). The CIA also appears to be monitoring Zammar by this time. Author Terry McDermott will later comment: “[T]he CIA told the [9/11 Congressional Inquiry] it had a long-standing interest in Zammar that pre-dated [a wiretap done in March 1999 (see March 1999)]. In other words, the CIA appears to have been investigating the man who recruited the hijackers at the time he was recruiting them.” [McDermott, 2005, pp. 73, 278-279]
Late 1998: German Intelligence Begins Monitoring Al-Qaeda Hamburg Cell Member Bahaji
German intelligence investigates al-Qaeda Hamburg cell member Said Bahaji. The investigation stems from an investigation into cell member Mohammed Haydar Zammar, which started in 1997 (see March 1997-Early 2000). Many contacts are noticed between Zammar and Bahaji. According to the Los Angeles Times: “In part because of the acquaintance, German police in 1998 performed what they describe as limited surveillance on Bahaji. Bahaji at the time was living with [future 9/11 hijacker Mohamed] Atta and [hijacker associate Ramzi] bin al-Shibh. Nothing came of the surveillance and it was discontinued.” [Los Angeles Times, 9/1/2002] However, German officials will not say when exactly the surveillance stops. [Associated Press, 6/22/2002] Bahaji lives with Atta and bin al-Shibh at the Marienstrasse apartment starting in November 1998 (see November 1, 1998-February 2001), so the surveillance of him probably starts in late 1998. However, it is likely that interest in and possibly surveillance of Bahaji continues after this time. Bahaji will be watchlisted in March 2000 (see March 2000). Author Terry McDermott will later comment about the difficulty of being put on a watch list: “In Germany, this was not a casual event. In order to be placed on such lists, intelligence agencies had to go to great lengths to demonstrate to the Bundestag, the German parliament, that the person under question was of potential danger to the state.” McDermott will further note that being placed on this list would be an indication the person has been under surveillance for a long time. [McDermott, 2005, pp. 73, 297]
March 1999: Germany Provides CIA the First Name and Phone Number of 9/11 Hijacker Marwan Alshehhi; CIA Takes No Action
German intelligence gives the CIA the first name of 9/11 hijacker Marwan Alshehhi and his telephone number of a phone registered in the United Arab Emirates (UAE). The Germans learned the information from the surveillance of al-Qaeda Hamburg cell member Mohammed Haydar Zammar (see March 1997-Early 2000). They tell the CIA that Alshehhi, who is living in Bonn, Germany, at the time, may be connected to al-Qaeda. He is described as a UAE student who has spent some time studying in Germany. The conversation is short, but a known alias of Mamoun Darkazanli is mentioned. The CIA is very interested in Darkazanli and will try to recruit him as an informant later in the year (see Late 1998 and December 1999). [US Congress, 7/24/2003 
; Deutsche Presse-Agentur (Hamburg), 8/13/2003; New York Times, 2/24/2004; McDermott, 2005, pp. 73, 278-279]
No Response from CIA – The Germans consider this information “particularly valuable” and ask the CIA to track Alshehhi, but the CIA never responds until after the 9/11 attacks. The CIA decides at the time that this “Marwan” is probably an associate of bin Laden but never track him down. It is not clear why the CIA fails to act, or if they learn his last name before 9/11. [New York Times, 2/24/2004] The Germans monitor other calls between Alshehhi and Zammar, but it isn’t clear if the CIA is also told of these or not (see September 21, 1999).
Could the Number Be Traced? – CIA Director George Tenet will later dismiss the importance of this information in a statement to the 9/11 Congressional Inquiry. He will say that all the CIA had to go on was a first name and an impossible to trace unlisted number. But author Terry McDermott will later comment, “At least a portion of that statement is preposterous. The UAE mobile telephone business was, until 2004, a state monopoly. The UAE number could have been traced in five minutes, according to senior security officials there. The United States never asked.” McDermott will add, “Further, the CIA told the [9/11 Congressional Inquiry] it had a long-standing interest in Zammar that pre-dated these recordings. In other words, the CIA appears to have been investigating the man who recruited the hijackers at the time he was recruiting them.” [McDermott, 2005, pp. 73, 278-279]
January-October 2000: Al-Qaeda Hamburg Cell Member Essabar Attends Afghan Training Camp and Fails to Get US Visa
Al-Qaeda Hamburg cell member Zakariya Essabar attends an al-Qaeda training camp near Kandahar, Afghanistan. He leaves for the camp in January 2000 and stays at the camp for an usually long time—nine months—until October. Hamburg cell member Mounir El Motassadeq is at the same camp from late May until August 2000 (see May 22 to August 2000). The two of them train separately but see each other often. Hamburg associate Abdelghani Mzoudi also attends the same camp around this time (see Summer 2000).
Attempt to Become a 9/11 Pilot? – When Essabar returns from the camp, he applies for a new passport, saying that he lost his previous one. When he gets a new one, he applies for a US visa. However, his application is rejected, probably because, as a Moroccan citizen, he is deemed an economic risk. Author Terry McDermott will later comment, “The timing suggests that [the Hamburg cell was] intent on finding a fourth pilot” for the 9/11 attacks. [McDermott, 2005, pp. 194, 201-202]
March 2000: German Intelligence Places Two 9/11 Hijacker Associates on a German Watch List
German intelligence places two members of the al-Qaeda Hamburg cell, Mounir El Motassadeq and Said Bahaji, on a German watch list. The two men, associates of future 9/11 hijackers Mohamed Atta, Marwan Alshehhi, and Ziad Jarrah, had come to the Germans’ attention because of their association with al-Qaeda recruiter Mohammed Haydar Zammar, who they meet regularly. The watchlisting means that their arrivals and departures to and from Germany will be reported immediately. [Der Spiegel (Hamburg), 2/3/2003; US Congress, 7/24/2003 ] Hamburg cell member Mohammed Haydar Zammar is also placed on a watch list at some point before 9/11 (see Before September 11, 2001). El Motassadeq was first investigated by German authorities in 1998 (see August 29, 1998). Bahaji was the target of a surveillance investigation starting in 1998 as well (see (Late 1998)). Bahaji may have recently traveled to Afghanistan with some associates using a route monitored by European intelligence agencies (see Late November-Early December 1999).
El Motassadeq’s Travels Will Be Noticed Three Times – Because he is watchlisted, German intelligence will keep track when El Motassadeq goes to Denmark twice, and when he flies to Istanbul on his way to a training camp in Afghanistan (see May 22, 2000). [New York Times, 1/18/2003]
Importance of Watchlisting – Author Terry McDermott will later comment about the watchlisting of El Motassadeq: “In Germany, this was not a casual event. In order to be placed on such lists, intelligence agencies had to go to great lengths to demonstrate to the Bundestag, the German parliament, that the person under question was of potential danger to the state. Being placed on the list indicated that El Motassadeq had been under investigation for some time. In that he was an integral part of the group that included [Atta], [Ramzi bin al-Shibh], and Alshehhi, this at the least implies that they were being watched too.” [McDermott, 2005, pp. 73, 297]
Just Before September 11, 2001: Core of Al-Qaeda Probably less than 1,000 Operatives
Newsweek will report in 2006, “The intelligence community generally agrees that the number of true A-list al-Qaeda operatives out there around the time of 9/11 was no more than about 1,000, perhaps as few as 500, most in and around Afghanistan.” [Newsweek, 6/28/2006] John Arquilla, a Special Operations expert at the Naval Postgraduate School in Monterey, California, makes a higher end estimate, claiming “there were probably 3,000 core al-Qaeda operatives” around the time of 9/11. [Newsweek, 8/28/2007] US intelligence will later conclude that about 20,000 people passed through al-Qaeda training camps from 1996 to 9/11, and many of them will keep some level of affiliation with the group. However, only about 180 operatives have pledged loyalty to Osama bin Laden by 9/11. Counterterrorism expert Rohan Gunaratna will say, “Al-Qaeda is an elite organization that takes very few members.” [New York Times, 9/10/2002; US News and World Report, 6/2/2003] Ali Soufan, an FBI agent focusing on al-Qaeda before 9/11, will later claim that at the time of 9/11, al-Qaeda had about 400 members. [Soufan, 2011, pp. xxiii] Author Terry McDermott will later comment: “Over 20-plus years, tens of thousands of men went through the Afghan training camps. In the same period, nearly a dozen attacks attributed to Islamic fundamentalists occurred around the world. But most of these men and most of these attacks had little, other than overlapping intent, to do with al-Qaeda. Most were independent groups running independent, often local, operations. In the attacks that were instigated by al-Qaeda, the same handful of people were involved in virtually every one. Even foot soldiers were recycled to new operations. The organization was so small that almost everybody in it at one time or another had personal interactions with top leadership.” [McDermott, 2005, pp. 194, 201-202]
September 11-13, 2001: 9/11 Hijackers Leave a Clear Trail of Evidence
Investigators find a remarkable number of possessions left behind by the hijackers: 
Two of Mohamed Atta’s bags are found on 9/11. They contain a handheld electronic flight computer, a simulator procedures manual for Boeing 757 and 767 aircraft, two videotapes relating to “air tours” of the Boeing 757 and 747 aircraft, a slide-rule flight calculator, a copy of the Koran, Atta’s passport, his will, his international driver’s license, a religious cassette tape, airline uniforms, a letter of recommendation, “education related documentation” and a note (see September 28, 2001) to other hijackers on how to mentally prepare for the hijacking. [Sydney Morning Herald, 9/15/2001; Boston Globe, 9/18/2001; Independent, 9/29/2001; Associated Press, 10/5/2001] Author Terry McDermott will later comment, “Atta’s bag contained nearly every important document in his life… If you wanted to leave a roadmap for investigators to follow, the suitcase was a pretty good place to start.” [McDermott, 2005, pp. 306] Marwan Alshehhi’s rental car is discovered at Boston’s Logan Airport containing an Arabic language flight manual, a pass giving access to restricted areas at the airport, documents containing a name on the passenger list of one of the flights, and the names of other suspects. The name of the flight school where Atta and Alshehhi studied, Huffman Aviation, is also found in the car. [Los Angeles Times, 9/13/2001] A car registered to Nawaf Alhazmi is found at Washington’s Dulles Airport on September 12. This is the same car he bought in San Diego in early 2000 (see March 25, 2000). Inside is a copy of Atta’s letter to the other hijackers, a cashier’s check made out to a flight school in Phoenix, four drawings of the cockpit of a 757 jet, a box cutter-type knife, maps of Washington and New York, and a page with notes and phone numbers. [Arizona Daily Star, 9/28/2001; Cox News Service, 10/21/2001; Die Zeit (Hamburg), 10/1/2002] The name and phone number of Osama Awadallah, a friend of Alhazmi and Khalid Almihdhar in San Diego, is also found on a scrap of paper in the car (see September 12, 2001 and After). [CNN, 2/1/2002] A rental car is found in an airport parking lot in Portland, Maine. Investigators are able to collect fingerprints and hair samples for DNA analysis. [Portland Press Herald, 10/14/2001] A Boston hotel room contains airplane and train schedules. [Sydney Morning Herald, 9/15/2001] FBI agents carry out numerous garbage bags of evidence from a Florida apartment where Saeed Alghamdi lived. [CNN, 9/17/2001] Two days before 9/11, a hotel owner in Deerfield Beach, Florida, finds a box cutter left in a hotel room used by Marwan Alshehhi and two unidentified men. The owner checks the nearby trash and finds a duffel bag containing Boeing 757 manuals, three illustrated martial arts books, an 8-inch stack of East Coast flight maps, a three-ring binder full of handwritten notes, an English-German dictionary, an airplane fuel tester, and a protractor. The FBI seizes all the items when they are notified on September 12 (except the binder of notes, which the owner apparently threw away). [Miami Herald, 9/16/2001; Associated Press, 9/16/2001] In an apartment rented by Ziad Jarrah and Ahmed Alhaznawi, the FBI finds a notebook, videotape, and photocopies of their passports. [Miami Herald, 9/15/2001] In a bar the night before 9/11, after making predictions of a attack on America the next day, the hijackers leave a business card and a copy of the Koran at the bar. The FBI also recovers the credit card receipts from when they paid for their drinks and lap dances. [Associated Press, 9/14/2001] A September 13 security sweep of Boston airport’s parking garage uncovers items left behind by the hijackers: a box cutter, a pamphlet written in Arabic, and a credit card. [Washington Post, 9/16/2001] A few hours after the attacks, suicide notes that some of the hijackers wrote to their parents are found in New York. Credit card receipts showing that some of the hijackers paid for flight training in the US are also found. [Los Angeles Times, 9/13/2001] A FedEx bill is found in a trash can at the Comfort Inn in Portland, Maine, where Atta stayed the night before 9/11. The bill leads to Dubai, United Arab Emirates, allowing investigators to determine much of the funding for 9/11. [Newsweek, 11/11/2001; London Times, 12/1/2001] A bag hijackers Alhazmi and Almihdhar left at a mosque in Laurel, Maryland, is found on September 12. The bag contains flight logs and even receipts from flight schools from San Diego the year before (see September 9, 2001). On 9/11, in a Days Inn hotel room in Newark, New Jersey, investigators find used plane tickets for Saeed Alghamdi, Ahmed Alhaznawi, Ziad Jarrah, and Ahmed Alnami. The tickets are all from a Spirit Continental Airlines flight from Ft. Lauderdale, Florida, to Newark on September 7. Also, flight manuals for Boeing 757 and 767 airplanes are found in English and Arabic. [Investigative Services Division, FBI Headquarters, 4/19/2002]
The hijackers past whereabouts can even be tracked by their pizza purchases. An expert points out: “Most people pay cash for pizza. These [hijackers] paid with a credit card. That was an odd thing.” [San Diego Union-Tribune, 9/3/2002] “In the end, they left a curiously obvious trail—from martial arts manuals, maps, a Koran, Internet and credit card fingerprints. Maybe they were sloppy, maybe they did not care, maybe it was a gesture of contempt of a culture they considered weak and corrupt.” [Miami Herald, 9/22/2001] The New Yorker quotes a former high-level intelligence official as saying: “Whatever trail was left was left deliberately—for the FBI to chase” (see Late September 2001). [New Yorker, 10/8/2001]
December 14, 2001-September 28, 2005: Media Accounts Differ on What the US Knew and Did about 9/11 Hijacker Jarrah’s Detention in Dubai
On December 14, 2001, it is first reported that 9/11 hijacker Ziad Jarrah was stopped and questioned at Dubai airport (see January 30-31, 2000); a controversy follows on when the US was told about this and what was done about it.
Initial Account – The story of Jarrah being detained at Dubai, United Arab Emirates (UAE), first appears in the Chicago Tribune on December 14. This initial report says that Jarrah was stopped because he was on a US watch list. US officials refuse to comment on the matter. (Note that this report and most other early accounts place the incident on January 30, 2001 (see January 31, 2000 and After), but this appears to be incorrect and later reports say it happened exactly one year earlier, on January 30, 2000.) [Associated Press, 12/14/2001]
Did the US Tell the UAE to Stop Jarrah? – Jane Corbin reports the same story for the BBC in December 2001 and then repeats it in a book. Once again, US officials refuse to comment on the story. In her account, UAE officials claim Jarrah was stopped based on a tip-off from the US. A UAE source tells Corbin: “It was at the request of the Americans and it was specifically because of Jarrah’s links with Islamic extremists, his contacts with terrorist organizations. That was the extent of what we were told.” [BBC, 12/12/2001; Corbin, 2003] One day after the BBC report, a US official carefully states that the FBI was not aware before 9/11 that another US agency thought Jarrah was linked to any terrorist group. [South Florida Sun-Sentinel, 12/13/2001]
CNN Revives the Story, Has More Sources – In August 2002, CNN also reports that Jarrah was stopped because he was on a US watch list. It claims this information comes not only from UAE sources, but from other governments in the Middle East and Europe. It also still refers to the incorrect January 31, 2001 date. For the first time, a CIA spokesperson comments on the matter and says the CIA never knew anything about Jarrah before 9/11 and had nothing to do with his questioning in Dubai. [CNN, 8/1/2002]
Denials Are Helped by Confusion over Date – Regarding the denials by US authorities, author Terry McDermott point outs: “It is worth noting, however, that when the initial reports of the Jarrah interview [came out,] the Americans publicly denied they had ever been informed of it. As it happened, Corbin had the wrong date for the event, so the American services might have been technically correct in denying any knowledge of it. They later repeated that denial several times when other reports repeated the inaccurate date.” Based on information from his UAE sources, McDermott concludes that the stop occurred and that the US was informed of it at the time. [McDermott, 2005, pp. 294-5]
FBI Memo Confirms US Was Notified – In February 2004, the Chicago Tribune claims it discovered a 2002 FBI memo that discusses the incident. The memo clearly states that the incident “was reported to the US government” at the time. This account uses the January 30, 2000 date, and all later accounts do so as well. [Chicago Tribune, 2/24/2004]
9/11 Commission Downplays Incident – In July 2004, the 9/11 Commission calls the incident a “minor problem” and relegates it to an endnote in its final report on the 9/11 attacks. It does not mention anything about the US being informed about Jarrah’s brief detention at the time it happened. In this account, Jarrah was not on a US watch list, but he raised suspicion because of an overlay of the Koran in his passport and because he was carrying religious tapes and books. [9/11 Commission, 7/24/2004, pp. 496]
Vanity Fair Adds New Details – A November 2004 Vanity Fair article adds some new details. In this account, UAE officials were first suspicious of Jarrah because of a page of the Koran stuck in his passport, then they searched his luggage and found it full of jihadist propaganda videos. Six months earlier, the CIA had asked immigration throughout the region to question anyone who might have been to a training camp in Afghanistan, which gave the UAE even more reason to question him. Jarrah was asked about his time in Afghanistan and revealed that he intended to go to flight school in the US, but he was let go. The UAE told the CIA about all this, but German officials say the CIA failed to pass the information on to German intelligence. [Vanity Fair, 11/2004]
German and More FBI Documents Also Confirm US Was Involved – McDermott has access to German intelligence files in writing his book published in 2005. He says that German documents show that the UAE did contact the US about Jarrah while he was still being held. But the US had not told the Germans what was discussed about him. Other FBI documents confirming the incident are also obtained by McDermott, but they indicate the questioning was routine. UAE officials insist to McDermott this is absolutely untrue. McDermott suggests that the CIA may not have told the FBI much about the incident. He also says that while UAE officials were holding Jarrah, US officials told them to let Jarrah go because the US would track him (see January 30-31, 2000). [McDermott, 2005, pp. 294]
Continued Denials – In September 2005, US officials continue to maintain they were not notified about the stop until after 9/11. [Chicago Tribune, 9/28/2005] Original reporting on the incident will not occur much in the years after then.
