The CIA and Malaysian government came under fire for failing to identify members of the summit and arrest them before the attacks were successfully carried out.
Before the meeting, the United States intercepted a telephone call to Yemen by al-Mihdhar concerning arrangements for the trip.
By request of the CIA, the Malaysian authorities videotaped the meeting, but no sound recordings were made.
Ramzi bin al-Shibh's attendance at the meeting was discovered by the investigators by looking into his credit card records.
Sufaat was later arrested, but he denied that he knew any of the men and said that Hambali had arranged the meeting.