The man accused of plotting to kill Americans with a car bomb in Times Square appeared relaxed and obedient in his first appearance in a Manhattan courtroom, where he was told by a magistrate judge that he had the right to remain silent.

Authorities say Faisal Shahzad's willingness to talk kept him out of court for two weeks, speeding up the progress of an investigation into his May 1 plot to set off a homemade car bomb on a spring Saturday evening amidst hundreds of people enjoying the tourist haven.

Authorities said shortly after Shahzad's May 3 arrest that he had admitted driving the SUV bomb into Times Square and told authorities he had received terror training during a recent five-month trip to Pakistan.

His cooperation did not eliminate the need to bring him to court Tuesday to face five charges, including attempted use of weapons of mass destruction and attempted acts of terrorism transcending national boundaries, each of which carry potential penalties of life in prison.