of activating Ressam. The Canadian Security Intelligence Service (CSIS) put Slahi under surveillance for several weeks but did not find any grounds to arrest him. According to a classified report of German intelligence, "there is not only no evidence of any involvement by Ould Slahi in the planning and preparation of the attacks, but also no indication that Ressam and Slahi knew each other." Slahi left Canada on January 21, 2000, to return to Mauritania. During his trip home, Slahi was arrested in Senegal at the request of United States authorities and questioned about the millennium plot. He was transferred to Mauritania to be interrogated by local authorities and United States FBI agents. After three weeks in custody, during which Slahi was accused of being involved in the millennium plot, he was released. Slahi worked at various companies in Mauritania as an electrical engineer starting in May 2000. After the September 11 attacks, the U.S. renewed scrutiny of everyone suspected of having ties to al Qaeda. On September 29, he was again detained by the Mauritanian authorities for questioning. He cooperated with the authorities several more times and then for the last time starting on November 20, 2001. Slahi was interrogated by both Mauritanian officials and the FBI for seven days. Then the CIA transported him to Jordan using extraordinary rendition. The CIA supervised his interrogation at a Jordanian prison for eight months. Slahi claims he was tortured and forced to confess to involvement with the millennium plot. On July 19, 2002, the CIA transported Slahi to Bagram, Afghanistan, where he was transferred to military custody and held at the detention facility. The US military flew Slahi to Guantanamo Bay detention camp on August 4, 2002. Guantánamo Bay detention Slahi was assigned detainee ID number 760 and was initially held in Camp Delta. Officials belonging to the CSIS interviewed Slahi in February 2003. He was among 14 men classified as high-value detainees, for whom United States Secretary of Defense Donald Rumsfeld authorized use of what were called enhanced interrogation methods, which have since been classified as torture. By January 2003, US military interrogators pressed to make Slahi their second "Special Project," drawing up an interrogation plan like that used against Mohammed al-Qahtani. Declassified documents show that Slahi was transferred to an isolation cell near the end of May and abusive interrogation started. He was subjected to extreme cold and noise,