9/11 retrial denied key witness
The decision was announced as Moroccan Mounir al-Motassadek appeared in court in Hamburg, Germany, yesterday.
The stance is seen as a major blow for the prosecutors.
They had hoped to use testimony from Ramzi Binalshibh, an al-Qaeda suspect in US custody, to reverse the quashing of Motassadek's earlier conviction.
A letter from the US Justice Department read in court said terror suspects in American custody would not be allowed |o testify.
The letter cited security concerns, as well as the need to protect secret information.
The Justice Department also said an FBI agent would be sent to give evidence at the retrial.
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