Faisal Shazhad, 30, has already been charged with the attempted bombing
The man accused of trying to detonate a car bomb in New York's Times Square has appeared in court, for the first time since his arrest on 3 May.
Pakistani-born US citizen Faisal Shahzad, 30, did not enter a plea on the five charges he faces.
A court appearance normally occurrs within a couple of days of a US arrest but officials say Mr Shahzad waived his rights while he was co-operating.
Mr Shahzad was arrested at JFK airport in New York as he tried to flee the US.
US officials have said Mr Shahzad has provided investigators with valuable intelligence since his arrest, and have said the Pakistani Taliban was behind the attack.
'Training in Pakistan'
Last week investigators arrested three men after searches in four states, with Attorney General Eric Holder saying the arrests were linked to Mr Shahzad's alleged bombing attempt.
The men are being held on immigration charges.
Mr Shahzad lived in Connecticut, and had recently returned from an extended trip to Pakistan.
US authorities say Mr Shahzad told investigators he had received training in bomb making in Waziristan, a tribal region of north-west Pakistan.
On 1 May, police discovered an SUV in Times Square loaded with fertiliser, fireworks, gasoline, propane and alarm clocks.
Investigators traced the vehicle back to Mr Shahzad, officials say, and he was arrested about 53 hours later.