Updated

The trial of five Guantanamo Bay prisoners accused of planning the Sept. 11 attacks is facing another potential delay.

Defense lawyers are asking the Pentagon to extend a deadline for pretrial legal motions. The motions must be submitted and reviewed before the men can be arraigned on the charges at the U.S. base in Cuba, which was expected to happen this year.

But the defense teams say they have been delayed in part by a dispute over new rules for legal mail. A lawyer for Ramzi Binalshibh has asked for a six-month extension. The lawyer for Mustafa Ahmad al-Hawsawi is seeking four more months. Their trial started in June 2008 but was halted by a political fight over the venue.