US Defence Secretary Lloyd Austin has revoked a pre-trial agreement reached with men accused of plotting the 11 September 2001 terrorist attacks.
In a memo on Friday, Mr Austin also said he was revoking the authority of the officer overseeing the military court who signed the agreement on Wednesday.
The original deal, which would reportedly have spared the alleged attackers the death penalty, was criticised by some families of victims.
The 9/11 attacks in New York, Virginia and Pennsylvania were the deadliest assault on US soil since the 1941 Japanese attack on Pearl Harbor, Hawaii, where 2,400 people were killed.
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