The trial of five detainees accused of aiding the 9/11 plot has been delayed once again after two of them claimed that a translator they had been appointed as part of their defense team was a CIA agent who worked at a secret torture prison.

"The problem is I cannot trust him because he was working at the black site with the CIA, and we know him from there," defendant Ramzi Bin Al-Shibh said the moment the hearing started on Monday, according to the Miami Herald.

Another of the defendants, Walid bin Attash, verified the identity of the CIA agent. His attorney told those gathered that bin Attash was "visibly shaken" on seeing the CIA operative.