While the 9/11 hijackers are in the US, the NSA intercepts several calls between them and an al-Qaeda communications hub in Sana’a, Yemen, run by Ahmed al-Hada, who is hijacker Khalid Almihdhar’s father-in-law (see August 4-25, 1998).
Summary of Calls – 
The first calls are made by Almihdhar and are intercepted during the spring and summer of 2000 (see Spring-Summer 2000). More calls are made by hijacker Nawaf Alhazmi after the bombing of the USS Cole in October 2000 (see Mid-October 2000-Summer 2001). The final call from the US is intercepted just a few weeks before 9/11 (see (August 2001)).
The NSA intercepted the hijackers’ calls outside the US before this (see Early 1999 and December 29, 1999) and continues to do so in 2000 (see Summer 2000) after Almihdhar returns to Yemen (see June 10, 2000 and (Mid-June-Mid-July 2000)).
Calls’ Content – Some of the calls may only contain non-operational information, as they are reportedly between Almihdhar and his wife. [9/11 Commission, 7/24/2004, pp. 222; Suskind, 2006, pp. 94; Wright, 2006, pp. 343] However, the calls are also used to relay messages to the 9/11 hijackers. [Embassy of Yemen (Washington), 2/13/2002; MSNBC, 2/14/2002; MSNBC, 5/2005]
Agencies’ Roles – The CIA is the lead agency monitoring the communications hub. It has planted bugs inside it and is wiretapping all calls (see Late August 1998). Intercepts of calls to and from the hub are a major plank of the US intelligence community’s effort to fight al-Qaeda. Also involved is the FBI, which is using phone records to plot these calls on a map (see Late 1998-Early 2002). Some of the calls intercepted by US intelligence come from Osama bin Laden’s satellite phone in Afghanistan (see August 4-25, 1998 and Late August 1998). After 9/11, counterterrorism officials will say that the number was one of the hottest targets being monitored by the NSA and was an “intelligence bonanza.” [Los Angeles Times, 12/21/2005; Wright, 2006, pp. 343]
Importance of Failure – Also after 9/11, counterterrorism officials will agree that the failure to follow leads to the US from this number was a huge missed opportunity to stop the 9/11 plot. For instance, FBI agent Kenneth Maxwell will say: “Two al-Qaeda guys living in California—are you kidding me? We would have been on them like white on snow: physical surveillance, electronic surveillance, a special unit devoted entirely to them.” [MSNBC, 7/21/2004; New Yorker, 7/10/2006 
]
Discussed after 9/11 – The failure to roll up the plot based on these communications intercepts will be discussed following 9/11 (see Summer 2002-Summer 2004 and March 15, 2004 and After).
January 20, 2000: Al-Qaeda Leader Leaves Thailand; CIA Later Notified
Al-Qaeda leader Khallad bin Attash leaves Thailand and returns to Karachi, Pakistan. Bin Attash had come to Thailand with 9/11 hijackers Khalid Almihdhar and Nawaf Alhazmi (see January 8, 2000), who had departed for the US five days previously (see January 15, 2000). Bin Attash, Alhazmi, and Almihdhar had been under surveillance in Malaysia shortly before (see January 5-8, 2000) and were watchlisted around January 13 by the Thai authorities (see January 13, 2000), which are supposed to inform the US of the departure of the three men from Thailand. [9/11 Commission, 7/24/2004, pp. 159, 181; US Department of Justice, 11/2004, pp. 248 ] The CIA is informed of bin Attash’s departure in early March, but he is traveling under an alias and the CIA does not connect the alias to bin Attash. [9/11 Commission, 1/26/2004, pp. 6 ] Under interrogation after being captured by the US, bin Attash will say that after leaving Karachi he travels to Kandahar to meet Osama bin Laden. However, such statements are considered unreliable due to the methods used to extract them (see June 16, 2004). [9/11 Commission, 7/24/2004, pp. 159, 494]
January 30, 2000: 9/11 Hijacker Jarrah Detained and Questioned at Dubai Airport, Maybe Because He Is on US Watch List
Future 9/11 hijacker pilot Ziad Jarrah is briefly detained and questioned at the Dubai airport (see January 30-31, 2000), and some reports will suggest this is because he is already on a US watch list. It is not known when he may have been put on a watch list or why. The only information about this will come from conflicting accounts as to why Jarrah is stopped and questioned by immigration officials for several hours in Dubai, United Arab Emirates (UAE) on January 30.
Did the US Tell the UAE to Stop Jarrah? – According to one version, UAE officials claim Jarrah is stopped based on a tip-off from the US. A UAE source will tell author Jane 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.” [Corbin, 2003] In 2002, CNN will also report that Jarrah is stopped because he is on a US watch list. It claims this is sourced not only from UAE sources, but from other governments in the Middle East and Europe. However, US officials will claim no such tip-off was ever given. [CNN, 8/1/2002]
Passport and Religious Material Version – Other versions of the story will claim that Jarrah first raises suspicion because of an overlay of the Koran in his passport and because he is carrying religious tapes and books. This is what the 9/11 Commission will claim. [9/11 Commission, 7/24/2004, pp. 496] Other accounts, such as one in Vanity Fair in late 2004, will support this version. [Vanity Fair, 11/2004]
UAE Has Existing Program to Track Militants for the CIA – There may be a middle version of sorts, that Jarrah may be stopped because the CIA wants people with a profile just like his to be stopped. According to CNN: “The questioning of Jarrah in Dubai fits the pattern of a CIA operation described to CNN by UAE and European sources. Those sources say that in 1999, the CIA began an operation to track suspected al-Qaeda operatives, as they transited there. One of those sources provided [a] drawing showing the airport layout and describes how people wanted for questioning were intercepted, most often at a transit desk. As was the case with Ziad Jarrah, CNN sources say UAE officials were, often, told in advance by American officials who was coming in and whom they wanted questioned.” [CNN, 8/1/2002] It will also be reported that in the summer of 1999, the CIA asked immigration officials all over the region to question anyone who may have been returning from training camps in Afghanistan, and Jarrah fits that profile (see Summer 1999). [Vanity Fair, 11/2004]
January 30-31, 2000: UAE Wants to Arrest 9/11 Hijacker Jarrah; US Says No and Promises to Track Him
The UAE wants to arrest future 9/11 hijacker Ziad Jarrah, but US officials say they will track him instead, according to United Arab Emirates (UAE) officials. It is unknown if the US officials actually do so. On January 30, 2000, Jarrah is stopped and questioned as he is transiting through the airport in Dubai, UAE. Officials at the airport have agreed to help the CIA by monitoring or questioning suspicious militants passing through there (see 1999).
Conflicting Accounts – There will be some controversy about what happens next. According to a January 2002 FBI memo, “UAE authorities stopped Jarrah, apparently, because he had the Koran superimposed on part of his passport and he was carrying other religious materials.” [Chicago Tribune, 2/24/2004] But according to UAE officials, Jarrah is stopped because he is on a US watch list (see January 30, 2000).
Jarrah’s Admissions – Regardless of why he is stopped, Jarrah is questioned and he all but admits he has just been to training camps in Afghanistan. A UAE official will later say, “When we questioned him, he said he spent two months and five days in Pakistan, some part of it in Afghanistan.” Furthermore, Jarrah says that he is going to the US to preach Islam and learn to fly airplanes.
UAE Officials Want to Arrest Him, but US Says No – While Jarrah is being held at the airport, UAE officials contact US officials and ask what they should do with him. (Note that there is some controversy about this as well, but FBI and German documents indicate the US is contacted while Jarrah is still being held (see January 30, 2000).) A UAE official will later say: “What happened was we called the Americans. We said: ‘We have this guy. What should we do with him?‘… [T]heir answer was, ‘Let him go, we’ll track him.’ We were going to make him stay. They told us to let him go. We weren’t feeling very happy in letting him go.” [Chicago Tribune, 2/24/2004; McDermott, 2005, pp. 186-187, 294-295] According to another account, UAE officials have a discussion with officials at the US embassy in Dubai on what to do with Jarrah. After some discussion, they conclude they do not actually have any charge to arrest him with, so it is decided to let him go. [Chicago Tribune, 9/28/2005]
UAE Officials Track Him to Hamburg; They Notify US Intelligence – After several hours of questioning, Jarrah is let go. He is allowed to board a flight for Amsterdam, Netherlands, but the flight does not leave until the next day, giving officials more time to prepare to track him if they want to. UAE officials are aware that after Jarrah arrives in Amsterdam, he changes planes for Hamburg, Germany. A UAE official will later say, “Where he went from there, we don’t know.” In fact, Jarrah lives in Hamburg and is part of the al-Qaeda cell there with fellow 9/11 hijacker Mohamed Atta and others. According to the FBI memo, this information about Jarrah’s detention and questioning “was reported to the US government.” UAE officials are cautious about mentioning which part of the US government is informed, but the implication is that it is the CIA. [Associated Press, 12/14/2001; Chicago Tribune, 2/24/2004; McDermott, 2005, pp. 186-187] However, it is unknown if US intelligence does track Jarrah.
Late January 2000: CIA Faces Legal Barriers Helping Warlord Who Wants to Kill Bin Laden
By the start of 2000, US intelligence has had a particular focus on Darunta Camp, one of al-Qaeda’s training camps in Afghanistan. This simple camp near Jalalabad draws attention because of intelligence gathered during the last year indicating that al-Qaeda is experimenting with poisons and chemical weapons. The CIA has inserted a special device in the vicinity that can take high quality photographs of the camp from over ten miles away. Sometime in late January, the CIA learns that bin Laden has arrived in the camp. They pass this information on to Ahmed Shah Massoud and his Northern Alliance, who are fighting the Taliban and al-Qaeda. Massoud dispatches a small team on mules to get near the camp and fire rockets at bin Laden. However, when Massoud tells the CIA about this, the CIA’s lawyers are alarmed. They don’t want the CIA legally complicit if the operation kills innocent civilians and they order Massoud to withdraw his team. But due to poor communications the team goes ahead anyway and apparently shells the camp. However, bin Laden is not hurt and the incident passes without notice. Some US intelligence officials are upset at the legal policy that led to the order for Massoud’s team to withdraw. A new policy is drawn up allowing the CIA to assist Massoud on an operation if the primary purpose of the operation is to kill bin Laden or one of his top assistants. Otherwise, the US officially remains neutral in the war between the Northern Alliance and the Taliban. [Coll, 2004, pp. 487-490]
January 31, 2000 and After: CIA and UAE Officials Fail to Warn German Intelligence about 9/11 Hijacker Jarrah
The CIA and United Arab Emirates (UAE) officials apparently fail to warn German intelligence about future 9/11 hijacker Ziad Jarrah. On January 30, 2000, Jarrah was questioned at Dubai airport in the UAE, and the CIA was involved in a decision to not arrest him (see January 30-31, 2000). But even though Jarrah’s flight from Dubai was tracked to Hamburg, Germany, apparently neither US nor UAE officials warn German intelligence about Jarrah. During Jarrah’s brief detention he confessed that he had just come from Pakistan and Afghanistan, and he had a large number of jihadist propaganda videos in his luggage, leading UAE officials to strongly suspect he had just been to a militant training camp in Afghanistan. He also revealed that he has plans to learn how to fly airplanes in the US. An unnamed top German intelligence official will later say: “If we had been given the information that Jarrah had been to Afghanistan and was planning to go to flight school, we might have asked the Americans whether they thought this was normal.… If they had asked us, ‘Who is this guy who is learning to fly?’ then perhaps there might have been a different outcome.” He will suggest German intelligence might have started monitoring Jarrah, and thus discovered the 9/11 plot. However, this official will complain: “But it was one-way traffic [with the CIA]. You gave information, and you got no response.” The CIA will later deny that it has any knowledge of Jarrah before 9/11. [Vanity Fair, 11/2004] Note that a UAE official claims that the CIA said it would secretly track Jarrah from Dubai airport (see January 30-31, 2000). If this is true, it could explain why neither the UAE nor CIA told Germany about Jarrah.
February 2000: CIA Obtains Videotape from Al-Qaeda Summit in Malaysia, But Shows Little Interest in It
About a month after the Malaysia al-Qaeda summit (see January 5-8, 2000), “The CIA obtain[s] a surveillance videotape” from Malaysian intelligence “that shows men arriving at the meeting, according to a US intelligence official. The tape, he said, has no sound and [isn’t] viewed as very significant at the time.” [Los Angeles Times, 10/14/2001] Apparently, only the first day of the summit was videotaped (see January 5, 2000). Contents of the tape, which might definitively prove who was at the meeting, have never been made public, but the US Treasury will later mention that al-Qaeda leader Hambali and 9/11 hijackers Nawaf Alhazmi and Khalid Almihdhar were on the tape. [US Department of the Treasury, 1/24/2003 ] There is no evidence the CIA shares the videotape with any other agency before 9/11, and it has never been made public.
February 2000: CIA Rejects Foreign Request for Involvement with 9/11 Hijacker Almihdhar Search Due to Own Investigation
The 9/11 Congressional Inquiry will later report, “[I]n February 2000, CIA rejected a request from foreign authorities to become involved [in the search for and/or monitoring of 9/11hijacker Khalid Almihdhar] because CIA was in the middle of an investigation ‘to determine what the subject is up to.’” However, the CIA will later say it has no idea where Almihdhar is at this point (see January 13, 2000). The identity of the “foreign authorities” and the nature of the proposed assistance is not known. [US Congress, 7/24/2003, pp. 147 ]
Between February and September 2000: Malaysian Intelligence Stops Monitoring Al-Qaeda Summit Location, at CIA’s Request
After the al-Qaeda summit in Kuala Lumpur, Malaysia, in January 2000 (see January 5-8, 2000), the CIA has Malaysian intelligence stop monitoring the condominium where the summit was held. The condominium is owned by al-Qaeda operative Yazid Sufaat, who plays a key role in al-Qaeda search for biological weapons (see December 19, 2001). According to a later Newsweek account, after the summit, “Malaysian intelligence continued to watch the condo at the CIA’s request, but after a while the agency lost interest.” It is unclear when the surveillance stops exactly, but it stops some time before al-Qaeda operative Zacarias Moussaoui visits Malaysia in September 2000. Moussaoui stays in Sufaat’s condominium, but the CIA misses a chance to learn about this (see September-October 2000). The Malaysians will later say they were surprised by the CIA’s lack of interest. “We couldn’t fathom it, really,” Rais Yatim, Malaysia’s Legal Affairs minister, will tell Newsweek. “There was no show of concern.” [Newsweek, 6/2/2002]
February 11, 2000: CIA Station in Malaysia Reminds CIA Station in Thailand about 9/11 Hijacker Almihdhar and Companions
The CIA station in Kuala Lumpur, Malaysia, asks the CIA station in Bangkok, Thailand, what is happening with surveillance of future 9/11 hijackers Nawaf Alhazmi and Khalid Almihdhar, and al-Qaeda leader Khallad bin Attash. The CIA station in Kuala Lumpur had monitored the three when they were in Malaysia (see January 5-8, 2000) and passed the surveillance over to Bangkok when they flew there in early January (see January 8, 2000). [9/11 Commission, 7/24/2004, pp. 181, 502; US Department of Justice, 11/2004, pp. 247 ] Although, according to the 9/11 Commission, Bangkok station probably already knows that Alhazmi has departed for the US, it fails to respond for two weeks, when it claims it does not know what has happened (see (February 25, 2000)).
