Mr Mohammed was born in the Comoros islands in the early 1970s.

BBC: Profile: Fazul Abdullah Mohammed

In 1975, the Comoros Islands parliament declared unilateral independence from French rule.

CNN: Monday,

He is thought to have headed home to the Comoros islands in the Indian Ocean immediately after the attacks, but as FBI agents tried to trace him there, he boarded a plane to the Gulf and disappeared without trace.

BBC: Profile: Fazul Abdullah Mohammed