US Attorney's Office said, "The detention and preliminary hearing for David Coleman Headley that was scheduled for Friday, Dec 4 in US District Court in Chicago is cancelled and will not be held (as scheduled). There is no new date and no further information available at this time."
Headley's hearing was scheduled before US Magistrate Judge Arlander Keys. His lawyer John Theis was not available immediately for comment.
Headley was arrested by the Federal Bureau of Investigation (FBI) for allegedly plotting attacks in Denmark and India.
The Attorney's office also said the detention hearing for Tahawwur Hussain Rana, also in custody on similar terror charges, would proceed as per schedule on Dec 2 before Magistrate Judge Nan Nolan.