Under interrogation, Warsame gave up what officials called important intelligence about al-Qaida in Yemen and its relationship with al-Shabab militants in Somalia. Because those sessions were conducted before Warsame was read his Miranda rights, the intelligence could be used to underpin military strikes or CIA actions but were not admissible in court. After that interrogation was complete, the FBI stepped in and started the questioning over in a way that could be used in court. After the FBI read Warsame his rights, he opted to keep talking for days, helping the government build its case.
It was unclear Monday when al-Libi would be brought to the U.S. to face trial or whether there would be additional charges.
The Obama administration has said it can hold high value detainees on a ship for as long as it needs to. During his confirmation hearing in June 2011 to be the head of U.S. Special Operations Command, Adm. William McRaven said the U.S. could keep a detainee on a ship for as long as it takes to determine whether the U.S. could prosecute the suspect in civilian court or if the U.S. could return the suspect to another country.
The FBI and CIA had been tracking al-Libi for years, two former U.S. intelligence officials said. Both former officials spoke on condition of anonymity because they weren't authorized to speak about the case.
Officials said after 9/11 that al-Libi had been living in Iran for several years. He then moved to Pakistan before he returned to Libya prior to Moammar Gadhafi's government falling. He went back to Africa to be reunited with his family.
Once the fighting ended, the U.S. intelligence community began focusing on trying to capture al-Libi, the former official said, adding that the U.S. Army's Delta Force worked with local Libyans to apprehend al-Libi. One of the New York FBI's counterterrorism squads, CT-6 that focuses on Africa, played a significant role in the capture.
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Associated Press writer Adam Goldman contributed to this report.