The alleged mastermind of the 9/11 attacks on the US is to appear at a military tribunal at Guantanamo Bay.It will be Khalid Sheikh Mohammed's first time in public since he was captured in Pakistan in 2003.
Prosecutors are seeking the death penalty against him and four others also accused of plotting the attacks.
The BBC's Jonathan Beale - one of 60 journalists attending the trial - says the hearings raise questions about the legitimacy of US military commissions.
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