The surveillance was only the latest instance of compromised confidentiality at Guantanamo Bay, following revelations earlier this year that secret censors could block a public feed of court proceedings and that listening devices masked as smoke detectors were hidden in meeting rooms.
The next preliminary hearing for the September 11 defendants had been set to take place on April 22 at the US military base at Guantanamo.
James Connell, a lawyer for Pakistan’s Ali Abd al-Aziz Ali, said he had filed an emergency motion to the military judge presiding over the case “to pause proceedings in the 9/11 trial after revelations that defense email communications and computer files have been compromised.”