November 1, 1998-February 2001: Atta and Other Islamic Militants Are Monitored by US and Germany in Hamburg Apartment

The Marienstrasse building. [Source: Associated Press]Mohamed Atta and al-Qaeda operatives Said Bahaji and Ramzi Bin al-Shibh move into a four bedroom apartment at 54 Marienstrasse, in Hamburg, Germany, and stay there until February 2001 (Atta is already living primarily in the US well before this time). Investigators believe this move marks the formation of their 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 other al-Qaeda agents such as hijacker Marwan Alshehhi and cell member Zakariya Essabar. [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. From the very beginning, the apartment was officially under surveillance by German intelligence, because of investigations into businessman Mamoun Darkazanli that connect to Said 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] German intelligence monitors the apartment off and on for months, and wiretaps Mounir El Motassadeq, an associate of the apartment-mates who is later put on trial in August 2002 for assisting the 9/11 plot, but apparently do not find any indication of suspicious activity. [Chicago Tribune, 9/5/2002] Bahaji is directly monitored at least for part of 1998, but German officials have not disclosed when the probe began or ended. That investigation is dropped for lack of evidence. [Associated Press, 6/22/2002; Los Angeles Times, 9/1/2002] It is now clear that investigators would have found evidence if they looked more thoroughly. For instance, Zammar, a talkative man who has trouble keeping secrets, 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] Another visitor later recalls 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 was 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] Hijacker Waleed Alshehri also apparently stays at the apartment “at times.” [Washington Post, 9/14/2001; Washington Post, 9/16/2001] The CIA also starts monitoring Atta while he is living at this apartment, and does not tell Germany of the surveillance. Remarkably, the German government will claim it knew little about the Hamburg al-Qaeda cell before 9/11, and nothing directed them towards the Marienstrasse apartment. [Daily Telegraph, 11/24/2001]