Two members of the Hamburg cell comprising some of the lead 9/11 hijackers and their associates are absent from the city for periods. Ramzi bin al-Shibh vanishes from Germany over the summer, it is unclear where he goes. Marwan Alshehhi is unaccounted for over a period of three months. Before disappearing he withdraws over $5,000 from his bank and, while he is gone, his normally active credit card accounts are dormant. He makes no charges on them or withdrawals from ATM machines between September 3 and early December. Bin al-Shibh is again absent in the winter. Mohamed Atta is also absent from Hamburg around the same time (see Late 1997-Early 1998). Commenting on the disappearances, author Terry McDermott will say, “Practically, there is only one place they likely would have gone—Afghanistan.” [McDermott, 2005, pp. 57]
November 1, 1998-February 2001: 9/11 Hijacker Atta and Associates Are Monitored Some by US and Germany in Their Hamburg Apartment
Future 9/11 hijacker Mohamed Atta, al-Qaeda operatives Said Bahaji and Ramzi Bin al-Shibh, and others in the al-Qaeda Hamburg cell move into a four bedroom apartment at 54 Marienstrasse, in Hamburg, Germany, and some of them stay there until February 2001. Investigators will later believe this move marks the formation of the Hamburg al-Qaeda cell. [Los Angeles Times, 1/27/2002; New York Times, 9/10/2002] Up to six men at a time live at the apartment, including, at times, 9/11 hijacker Marwan Alshehhi and cell member Zakariya Essabar. Alshehhi moves out after the first month; it is unclear why. [New York Times, 9/15/2001] During the 28 months Atta’s name is on the apartment lease, 29 Middle Eastern or North African men register the apartment as their home address.
Surveillance of Bahaji – From the very beginning, the apartment is under surveillance by German intelligence, because of investigations into businessman Mamoun Darkazanli that connect to Bahaji. [Washington Post, 10/23/2001] The Germans also suspect connections between Bahaji and al-Qaeda operative Mohammed Haydar Zammar. [Los Angeles Times, 9/1/2002] Bahaji is directly monitored for at least part of 1998, but German officials will not disclose when the probe began or ends. This investigation is dropped for lack of evidence (see (Late 1998)). [Associated Press, 6/22/2002; Los Angeles Times, 9/1/2002] Bahaji moves out in July 1999 and gets married a few months later (see October 9, 1999). [Der Spiegel (Hamburg), 8/29/2011]
Surveillance of El Motassadeq – German intelligence monitors the apartment off and on for months, and wiretaps Mounir El Motassadeq, an associate of the apartment-mates who will later be convicted for assisting the 9/11 plot, but apparently it does not find any indication of suspicious activity (see August 29, 1998). [Chicago Tribune, 9/5/2002]
Surveillance of Zammar – Zammar, a talkative man who has trouble keeping secrets, does not live at the apartment, but he is a frequent visitor to the many late night meetings there. [Miller, Stone, and Mitchell, 2002, pp. 259-60; Los Angeles Times, 9/1/2002; Chicago Tribune, 9/5/2002] He even lives in the apartment for a time in February 1999 (see February 1999). Zammar is the focus of an investigation that began in 1997 and continues until early 2000 (see March 1997-Early 2000). Interest in monitoring him increases in late 1998 (see October 2, 1998).
Surveillance of Atta – The CIA also allegedly starts monitoring Atta in early 2000 while he is living at the apartment, and does not tell Germany of the surveillance (see January-May 2000). Atta leaves Germany to live in the US in June 2000 (see June 3, 2000).
No Direct German Surveillance of the Apartment? – Yet, even though people like Zammar who frequently phone and visit the apartment are monitored, German officials will later claim that the apartment itself is never bugged. An unnamed senior German security official will later say that some surveillance of associated people gives “the impression that the people living there were fanatical believers. At the BfV [Germany’s domestic intelligence agency], we had to decide whether to ask permission to place a wiretap on the line at 54 Marienstrasse itself. We discussed this every day.” But he will claim that they ultimately decide they will not be able to get legal permission for a wiretap because there is no evidence that the apartment’s occupants are breaking any laws. [Vanity Fair, 11/2004] This claim that the apartment was not directly monitored seems contradicted by reports that Bahaji was the target of a surveillance investigation when he was living in the Marienstrasse apartment in late 1998 (see (Late 1998)).
What Would More Surveillance Have Uncovered? – It will later be clear that investigators could have found evidence if they looked more thoroughly. For instance, one visitor will recall Atta and others discussing attacking the US. [Knight Ridder, 9/9/2002] 9/11 mastermind Khalid Shaikh Mohammed is in Hamburg several times in 1999 and comes to the apartment. However, although there is a $2 million reward for Mohammed since 1998, the US apparently fails to tell Germany what it knows about him (see 1999). [Newsweek, 9/4/2002; New York Times, 11/4/2002] 9/11 Hijacker Waleed Alshehri also apparently stays at the apartment “at times.” [Washington Post, 9/14/2001; Washington Post, 9/16/2001] Remarkably, shortly after 9/11, the German government will claim it knew little about the Hamburg al-Qaeda cell before 9/11, and nothing directed it towards the Marienstrasse apartment. [Daily Telegraph, 11/24/2001]
Late 1998-August 10, 1999: Pakistani Air Force Pilot Temporarily Replaces Alshehhi as Atta’s Roommate
Hijacker Marwan Alshehhi moved to Bonn, Germany in 1996, and studied German there. He then lived in Hamburg for several months in 1998, and returned to Bonn after failing a language exam. Just as he leaves town, a Pakistani student named Atif bin Mansour arrives in Hamburg, and begins living and studying together with Mohamed Atta. Early in 1999, Mansour applies with Atta for a room to hold a new Islamic study group. Mansour is a pilot on leave from the Pakistani Air Force. As the Los Angeles Times puts it, “This in itself is intriguing—a Pakistani pilot? Investigators acknowledge they haven’t figured out Mansour’s role in the plot, if any.” On this day, Mansour’s brother, also in the Pakistani armed forces, is killed (along with 15 other officers) when his surveillance plane is shot down by India. Mansour returns home and was detained and stopped from returning to Germany. Soon afterwards, Alshehhi returns to Hamburg. According to Mansoor’s father, “Atif was detained because he had not sought permission from the authorities before returning home to attend his younger brother’s funeral.” Then he is set free with assistance from a relative and works on Pakistani air force base. Contacted on his mobile phone by a reporter, Mansour says, “I won’t be able to speak further on such a sensitive issue.” [Rediff, 7/17/2002; Los Angeles Times, 9/1/2002; Washington Post, 9/11/2002] In March 2001, Mohamed Atta applies together with a Pakistani Air Force pilot for a security job with Lufthansa Airlines (see February 15, 2001). This pilot is a member of the same Islamic study group as Mansour, but it’s not clear if this is Mansour and he did come back to or stay in Germany, or if Atta was associating with a second Pakistani Air Force pilot. [Roth, 2001, pp. 9f; Newsday, 1/24/2002] The FBI later notes that Alshehhi arrived “almost as a replacement” for Mansour. After 9/11, the FBI asks Pakistan if the flight lieutenant and squad leader Mansour can be found and questioned about any possible role he may have had in the 9/11 plot, but there’s no indication Pakistan as to whether has ever agreed to this request. [Rediff, 7/17/2002] In late 2002, the German Federal Bureau of Criminal Investigations will say that Mansour remains “a very interesting figure.” [Los Angeles Times, 9/1/2002]
1999: Germans Miss Links between Hamburg 9/11 Hijackers and Key Al-Qaeda Operative
The 9/11 Commission will later call Mohamedou Ould Slahi “a significant al-Qaeda operative who, even [in late 1999], was well known to US and German intelligence, though neither government apparently knew he was operating in Germany.” [9/11 Commission, 7/24/2004, pp. 165]
Thinks He Was Monitored – However, while in US custody after 9/11, Slahi will allege that a phone call he received in January 1999 from his cousin Mahfouz Walad Al-Walid, a top al-Qaeda leader living in Afghanistan, was monitored. Slahi will say, “I later learned that my cousin was using Osama bin Laden’s satellite phone that was intercepted.” Another mutual cousin was arrested that month and Slahi says, “I wasn’t captured, but I am sure I was followed by the German police [and/or] German intelligence.” He claims the imam at his mosque told him that German officials had come to ask questions about him and was told Slahi had ties with terrorists. [US Department of Defense, 4/20/2006, pp. 184-216] In 2000, the New York Times will report that German authorities became interested in Slahi “shortly after the bombings of American Embassies in East Africa in 1998. The German authorities learned that [he] might have ties to Islamic extremists in Europe.” [New York Times, 1/29/2000]
Links to 9/11 Hijackers – After Hamburg al-Qaeda cell member Ramzi bin al-Shibh is captured in 2002, he will allegedly claim that Slahi was the one who originally recruited 9/11 hijackers Marwan Alshehhi and Ziad Jarrah. [Agence France-Presse, 10/26/2002] After 9/11, another prisoner in US custody will say that Slahi and bin al-Shibh met in Frankfurt in 1999 through an acquaintance. This acquaintance will go further and will claim Slahi knew bin al-Shibh and Jarrah since at least 1998 and that Slahi later lived with them in Hamburg. [9/11 Commission, 7/24/2004, pp. 496] In October 1999, bin al-Shibh and Alshehhi call Slahi, and he invites them to come to where he lives in Duisburg, Germany. Bin al-Shibh, Alshehhi, and Ziad Jarrah soon go visit him there. Karim Mehdi, an apparent leader of the al-Qaeda Ruhr Valley cell who will later be sentenced to nine years in prison for a post-9/11 plot, is also at this meeting. Bin al-Shibh, Alsehhi, and Jarrah follow Slahi’s advice to go to Afghanistan instead of Chechnya, and he gives them instructions on how to meet up with al-Qaeda operatives there. [9/11 Commission, 7/24/2004, pp. 165; Deutsche Presse-Agentur (Hamburg), 8/3/2005; Associated Press, 10/26/2006] US investigators later believe Slahi worked closely on al-Qaeda matters with bin al-Shibh and instructed another militant to go to the US and to take part in the 9/11 plot. Additionally, he is believed to have a key role in Ahmed Ressam’s millennium plot (see December 15-31, 1999). [Los Angeles Times, 4/24/2006]
No Action – German authorities are monitoring and wiretapping the phones at bin al-Shibh’s apartment throughout 1999 (see November 1, 1998-February 2001 and 2000), but they apparently do not connect Slahi to the Hamburg militants or do not act on that connection. The Germans will apparently miss another chance to learn of his ties to the Hamburg cell in April 2000, when Slahi is arrested for three weeks in Germany and then let go (see January-April 2000). [US Department of Defense, 4/20/2006, pp. 184-216] Note that the testimonies of detainees such as Slahi and bin al-Shibh are suspect due to widespread allegations that they were tortured into confessions (for instance, see September 27, 2001).
Between January and October 1999: Hamburg Cell Downloads Flight Training Software
According to German investigations, by at least this time, the al-Qaeda Hamburg cell including Mohamed Atta, Marwan Alshehhi, Ziad Jarrah, and Ramzi bin al-Shibh has come up with the idea of attacking the US using airplanes. This theory is based on witness statements and the discovery by the German police of a flight simulator file on a computer used by the Hamburg cell that was downloaded between January and October 1999. [Washington Post, 9/11/2002; Burke, 2004, pp. 244] Both Atta and Alshehhi start taking lessons on ultralight aircraft this year (see April 1999, October 1999, and December 1999). Some suggest they first joined the 9/11 plot in early 1999 (see Early 1999). However, the 9/11 Commission claims that the 9/11 plot was hatched by al-Qaeda’s leadership and was communicated to the Hamburg al-Qaeda cell in Afghanistan in December 1999. [9/11 Commission, 7/24/2004, pp. 165-169]
1999-September 10, 2001: Some 9/11 Hijackers Possibly Spend Time in Philippines
The names of four hijackers are later discovered in Philippines immigration records. However, whether these are the hijackers or just other Saudis with the same names has not been confirmed. 
Abdulaziz Alomari visits the Philippines once in 2000, then again in February 2001, leaving on February 12. [Associated Press, 9/19/2001; Philippines Inquirer, 9/19/2001; Daily Telegraph, 9/20/2001] Ahmed Alghamdi visits Manila, Philippines, more than 13 times, starting in 1999. He leaves the Philippines the day before the attacks. [Daily Telegraph, 9/20/2001; Arizona Daily Star, 9/28/2001; Filipino Reporter, 10/11/2001] Fayez Ahmed Banihammad visits the Philippines on October 17-19, 2000. [Daily Telegraph, 9/20/2001; Arizona Daily Star, 9/28/2001] Saeed Alghamdi visits the Philippines on at least 15 occasions in 2001, entering as a tourist. The last visit ends on August 6, 2001. [Daily Telegraph, 9/20/2001]
Hijackers Mohamed Atta and Marwan Alshehhi were seen Philippines several times, the last time in December 1999 (see December 1999). 9/11 mastermind Khalid Shaikh Mohammed occasionally stays there as well (see September 1998-January 1999). Nothing more has been heard to confirm or deny the hijackers’ Philippines connections since these reports.
January 31, 1999: Germany Monitors Call to 9/11 Hijacker Alshehhi, Shares Information with CIA
German intelligence is tapping the telephone of al-Qaeda operative Mohammed Haydar Zammar, and on this date, Zammar gets a call from a “Marwan.” This is later found to be future 9/11 hijacker Marwan Alshehhi. Marwan talks about mundane things, like his studies in Bonn, Germany, and promises to come to Hamburg in a few months. German investigators trace the telephone number and determine the call came from a mobile phone registered in the United Arab Emirates (UAE). [US Congress, 7/24/2003 
; Deutsche Presse-Agentur (Hamburg), 8/13/2003; New York Times, 2/24/2004] Although the call is short and seemingly innocuous, according to Vanity Fair, some “parts of the conversation seemed redolent of some kind of conspiratorial code.” For instance, at one point, Alshehhi says, “I’ve heard your mother died.” Zammar replies: “Yes, she passed on. She left me alone.” Alshehhi then asks: “But your father didn’t travel with you? I’ve seen him here.” Zammar answers, “No, my father is here.” Regarding whether or not it actually is code, a senior German official will later say: “Our desk officer had a certain feeling about that call.… You can say it was his nose—not that there was any single statement, but he had a feeling that there could be more behind it.” The desk officer writes a report about the call. Then, about a month later, the BfV (German domestic intelligence) will contact the CIA and ask for more information about men from the UAE named Marwan, and for help in tracing the phone number (see March 1999). [Vanity Fair, 11/2004]
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]
April 1999: 9/11 Hijackers Atta and Alshehhi Seen Near Philippine Flight School
9/11 hijacker Mohamed Atta takes flying lessons in the Philippines, and 9/11 hijacker Marwan Alshehhi is with him. They stay at the Woodland Park Resort Hotel near Angeles City, which is about 60 miles north of Manila and near the formerly US controlled Clark Air Base. Victoria Brocoy, a chambermaid at the hotel, will later claim that Atta stayed at the hotel for about a week while he learned to fly ultra-light planes at the nearby Angeles City Flying Club. [Gulf News, 9/29/2001; Gulf News, 10/2/2001] She also says, “He was not friendly. If you say hello to him, he doesn’t answer. If he asks for a towel, you do not enter his room. He takes it at the door.… Many times I saw him let a girl go at the gate in the morning. It was always a different girl.” [International Herald Tribune, 10/5/2001] Atta stays with some other men who call him Mohamed. She recalls that one of them is Marwan Alshehhi, who is treated like Atta’s sidekick. However, there are no recollections of Alshehhi going to the nearby flight school. [Manila Times, 10/2/2001; Gulf News, 10/2/2001] She says Atta was hosted by a Jordanian named Samir, who speaks Filipino and runs a travel agency in Manila. She adds that many Arab guests stayed at the hotel between 1997 and 1999, and Samir always accompanied them. Samir denies knowing any of the hijackers. [Gulf News, 9/29/2001; Manila Times, 10/2/2001; International Herald Tribune, 10/5/2001] The Philippine military will later confirm that Atta and Alshehhi were at the hotel after finding four other employees who claim to have seen them in 1999. Other locals, such as the manager of a nearby restaurant, also recall seeing them. [Philippine Star, 10/1/2001; Gulf News, 10/2/2001; International Herald Tribune, 10/5/2001; Asia Times, 10/11/2001] Atta and/or Alshehhi were seen at the same resort in 1997 (see 1997) and will return to it later in 1999 (see December 1999). A leader of a militant group connected to al-Qaeda later confesses to helping 9/11 hijacker pilots while they were in this area (see Shortly After October 5, 2005).
Mid-June 1999: 9/11 Hijackers Meet in Amsterdam and Get Saudi Cash
9/11 hijackers Mohamed Atta and Marwan Alshehhi, plus would-be hijacker Ramzi Bin al-Shibh and associate Mounir El Motassadeq, hold a meeting in Amsterdam, Netherlands. All are living in Hamburg at the time, so it is not clear why they go to meet there, though some speculate that they are meeting someone else. El Motassadeq also goes to the town of Eindhoven, Netherlands, on three occasions, in early 1999, late 1999, and 2001. [Associated Press, 9/13/2002] On at least one occasion, Motassadeq receives cash provided by unnamed “Saudi financiers” that is meant to fund a new Eindhoven mosque. Investigators believe he uses the money to help pay for some 9/11 hijacker flying lessons. [Baltimore Sun, 9/2/2002]
