The FBI conducts a counterterrorism inquiry on Omar al-Bayoumi, suspected al-Qaeda advance man, and possible Saudi agent. The FBI discovers he has been in contact with several people also under investigation. [US Congress, 7/24/2003 
] The FBI is given a tip that he was sent a suspicious package filled with wire from the Middle East, and that large numbers of Arab men routinely meet in his apartment. His landlord notices that he switches from driving a beat up old car to a new Mercedes. [Newsweek, 7/28/2003] According to the 9/11 Congressional Inquiry, the FBI notes that al-Bayoumi has “access to seemingly unlimited funding from Saudi Arabia.” For instance, an FBI source identifies him as a person who has delivered about $500,000 from Saudi Arabia to buy a mosque in June 1998 (see June 1998). However, the FBI closes the inquiry “for reasons that remain unclear .” [US Congress, 7/24/2003 ] Also in 1999, al-Bayoumi is working as an employee of the Saudi company Dallah Avco but apparently is doing no work. Someone in the company tries to fire him and sends a note to the Saudi government about this, since the company is so closely tied to the government. However, Mohammed Ahmed al-Salmi, the Director General of Civil Aviation, replies that it is “extremely urgent” his job is renewed “as quickly as possible,” and so he keeps his job. [Wall Street Journal, 8/11/2003]
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]
1999: KSM Repeatedly Visits 9/11 Hijacker Atta and Others in Al-Qaeda’s Hamburg Cell
9/11 mastermind Khalid Shaikh Mohammed (KSM) “repeatedly” visits 9/11 hijacker Mohamed Atta and others in the Hamburg al-Qaeda cell. [Associated Press, 8/24/2002] US and German officials say a number of sources place KSM at Atta’s Hamburg apartment, although when he visits, or who he visits while he is there, is unclear. [Los Angeles Times, 6/6/2002; New York Times, 11/4/2002] However, it would be logical to conclude that he visits Atta’s housemate Ramzi Bin al-Shibh, since investigators believe he is the “key contact between the pilots” and KSM. [Los Angeles Times, 1/27/2003] KSM is living elsewhere in Germany at the time. [New York Times, 9/22/2002] German intelligence monitors the apartment in 1999 but apparently does not notice KSM. US investigators have been searching for Mohammed since 1996, but apparently never tell the Germans what they know about him. [New York Times, 11/4/2002] Even after 9/11, German investigators will complain that US investigators do not tell them what they know about KSM living in Germany until they read it in the newspapers in June 2002. [New York Times, 6/11/2002]
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).
Early 1999: NSA Monitoring Hears 9/11 Hijacker Names, This Information Is Not Shared with CIA or FBI
As the NSA continues to monitor an al-Qaeda communications hub in Yemen run by hijacker Khalid Almihdhar’s father-in-law (see Late August 1998), they find references to Almihdhar and the hijacker brothers, Salem and Nawaf Alhazmi. They also learn that Almihdhar and Nawaf Alhazmi are long time friends. [9/11 Commission, 1/26/2004, pp. 6 ; 9/11 Commission, 1/26/2004] In early 1999, the NSA intercepts communications mentioning the full name “Nawaf Alhazmi.” However, this information is not disseminated to the intelligence community, as it apparently does not meet NSA reporting thresholds. The 9/11 Congressional Inquiry will say, “Those thresholds vary, depending on the judgement of the NSA analyst who is reviewing the intercept and the subject, location, and content of the intercept.” Another intelligence organisation intercepts the same or similar calls and reports this to the NSA. The Inquiry comments: “NSA’s practice was to review such reports and disseminate those responsive to US intelligence requirements. For an undetermined reason, NSA did not disseminate the […] report.” [Associated Press, 9/25/2002; US Congress, 10/17/2002; US Congress, 7/24/2003, pp. 135 ] The NSA continues to intercept such calls and finds more information a few months later (see Summer 1999 and Late Summer 1999). Near the end of 1999, there will be additional intercepts that give Khalid Almihdhar’s full name and the first names of the other two (see Shortly Before December 29, 1999). But while the NSA will provide some information about these new intercepts to the CIA and other agencies, they will not go back to the earlier intercepts to figure out Nawaf’s full name and close connection to Almihdhar (see December 29, 1999).
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]
February 17, 1999: Germans Monitor Call Mentioning Key Al-Qaeda Hamburg Cell Members, Including 9/11 Hijacker Atta’s Full Name and Number
German intelligence monitors a phone call in which the names of key members of the al-Qaeda Hamburg cell are mentioned. Future 9/11 hijacker Mohamed Atta’s full name and telephone number are even mentioned. German domestic intelligence (BfV) has been monitoring al-Qaeda operative Mohammed Haydar Zammar’s telephone (see March 1997-Early 2000). On this day, Zammar is not home, but his parents speak to each other on the phone and are trying to figure out where he is. One of them suggests that Zammar is at a meeting with “Mohamed, Ramzi, and Said,” and can be reached at the phone number of the Marienstrasse apartment where all three of them live. This refers to cell members Atta, Ramzi Bin al-Shibh, and Said Bahaji. “Mounir”—cell member Mounir El Motassadeq—is mentioned as well. However, apparently German intelligence fails to grasp the importance of these names, even though Bahaji and El Motassadeq are also under investigation at this time (see August 29, 1998). The Marienstrasse apartment is the center of the cell’s activity (see November 1, 1998-February 2001). [Associated Press, 6/22/2002; New York Times, 1/18/2003; Der Spiegel (Hamburg), 2/3/2003] Atta’s first and last name are mentioned in the phone call between Zammar’s parents. Agents check the Marienstrasse phone number, which they find is registered to Bahaji. They also confirm the street address, but it is not known what they make of the information. [Der Spiegel (Hamburg), 2/3/2003]
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 1, 1999: 9/11 Hijacker Jarrah Has Unofficial Wedding; Photograph Later Suggests German Intelligence Has Informant
9/11 hijacker Ziad Jarrah has an unofficial wedding with his girlfriend, Aysel Senguen, on or shortly before April 1, 1999. They have a wedding ceremony at the radical Al-Quds mosque, but they do not register the wedding with the German government, so it is not legally binding. [McDermott, 2005, pp. 78] A photo apparently taken by Jarrah at the wedding will be found by German intelligence in Senguen’s home several days after 9/11 (see Shortly After September 11, 2001). The photo will be studied to determine who was a member of or close to the al-Qaeda Hamburg cell in early 1999. German investigators are able to identify 18 out of 22 men in the photo. Those in the photo include 9/11 hijacker Atta, Abdelghani Mzoudi, Mounir El Motassadeq, Ramzi bin al-Shibh, Abderrasak Labied, and Mohammed Rajih. The LfV, the security service for the Hamburg region, will show such a surprising amount of knowledge of the people in the photo just days after 9/11 that it will later be suggested the LfV must have had an informant close to the Hamburg cell (see Shortly After September 11, 2001). [Frankfurter Allgemeine Zeitung (Frankfurt), 2/2/2003]
April 3-7, 1999: Three 9/11 Hijackers Obtain US Visas
9/11 hijackers Nawaf Alhazmi, Salem Alhazmi, and Khalid Almihdhar obtain US visas through the US Consulate in Jeddah, Saudi Arabia. [US Congress, 7/24/2003] Almihdhar and Nawaf Alhazmi are already “al-Qaeda veterans” and battle-hardened killers. Almihdhar’s visa is issued on April 7, and he can thereafter leave and return to the US multiple times until April 6, 2000. [Stern, 8/13/2003] Nawaf Alhazmi gets the same kind of visa; details about Salem are unknown. All three men have indicators in their passports marking them as Islamist radicals (see March 21, 1999, April 4, 1999, and April 6, 1999). These indicators are used to track them by the Saudi authorities, but are apparently not noticed by US officials. [9/11 Commission, 8/21/2004, pp. 9, 33 ] The CIA claims the hijackers then travel to Afghanistan to participate in “special training” with at least one other suicide bomber on a different mission. The training is led by Khallad bin Attash, who applies for a US visa on April 3 from Yemen, but fails to get one (see April 3, 1999). The CIA will learn about Almihdhar’s visa in January 2000 (see January 2-5, 2000). The Jeddah Consulate records the fact that Nawaf and Salem Alhazmi obtain US visas a couple of days before Almihdhar, but apparently these records are never searched before 9/11. [US Congress, 7/24/2003, pp. 135 ]
