A military judge has canceled a pretrial hearing for the alleged mastermind of the September 11, 2001, terrorist attacks.
The hearing for alleged terrorist Khalid Sheikh Mohammed had been scheduled to start later this month and end September 4.
"The judge cited issues that remain unresolved with regard to a claimed defense counsel conflict of interest," said Commander Gary Ross, a defense spokesman. He did not elaborate and no new date for the hearing was announced.
A pretrial hearing for Mohammed set in December 2014 was canceled without explanation.
Mohammed was captured in Pakistan on March 1, 2003. The 9/11 Commission Report identified him as the "principal architect" of the 9/11 attacks on U.S. soil.
Militants hijacked airplanes on September 11, 2001, and flew them into the towers of the World Trade Center in New York City. A third hijacked plane hit the Pentagon, and a fourth crashed in a field in Pennsylvania. The attacks killed almost 3,000 people.