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Who are Khalid Sheikh Mohammed and the other accused terrorists?

Khalid Sheikh Mohammed and four others are to stand trial in New York. Here's the evidence federal prosecutors will use against them.

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"Many roles," Attash replied, according to the transcript. "I participated in the buying or purchasing of the explosives. I put together the plan for the operation a year and a half prior to the operation. Buying the boat and recruiting the members that did the operation."

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The suicide attack in Yemen's port of Aden killed 17 US sailors and wounded 39.

Ramzi Bin al-Shibh

He was born in 1972 in southern Yemen. Al-Shibh was allegedly selected to participate in the 9/11 hijacking. He and three of the hijackers, including leader Mohammed Atta, met in Hamburg, Germany, in the late 1990s. They traveled to Afghanistan in 1999 where they allegedly met Osama Bin Laden, pledged their loyalty, and agreed to participate in a martyrdom mission against the US.

Al-Shibh was described by a senior Al-Qaeda military commander as a "highly professional jihadist," according to court documents. His Al-Qaeda instructions were reportedly to enroll in a flight training school in Florida where hijacker Ziad Jarrah was already attending classes. Al-Shibh paid a $2,350 deposit to the school. But he never got there.

After receiving a new passport in Germany, Al-Shibh tried four times but was unsuccessful in obtaining a US visa.

Instead of being a hijacker, Al-Shibh served the 9/11 operation as a key intermediary between the hijackers in the US and Al-Qaeda leaders in Pakistan and Afghanistan, according to a US report. He allegedly relayed instructions by email and phone and met with Atta in Spain in July 2001 to obtain a final briefing on the progress of the operation. He is alleged to have coordinated travel plans for some of the hijackers and helped transfer money to them.

He is reported to have sent $15,000 to Zacharias Moussaoui, who was then undergoing flight training in the US.

In a June 2002 interview with the television station Al-Jazeera, Al-Shibh and Khalid Sheikh Mohammed explained how the 9/11 attacks were planned and carried out. In the interview, Mohammed described Al-Shibh as a coordinator of the 9/11 attacks.

Ali Abdul-Aziz Ali

He is Khalid Sheikh Mohammed's nephew. Described as a close aide to his uncle, Ali set up bank accounts in the United Arab Emirates and allegedly helped transfer more than $100,000 to the hijackers in the US. He also allegedly helped facilitate the hijackers travel from Pakistan to the US via the UAE.

A witness told the FBI that during his time in the UAE Ali was in constant contact with his uncle.