From the NY Times:
WASHINGTON — American officials said Wednesday that it was very likely that a radical group once thought unable to attack the United States had played a role in the bombing attempt in Times Square, elevating concerns about whether other militant groups could deliver at least a glancing blow on American soil.
Officials said that after two days of intense questioning of the bombing suspect, Faisal Shahzad, evidence was mounting that the group, the Pakistani Taliban, had helped inspire and train Mr. Shahzad in the months before he is alleged to have parked an explosives-filled sport utility vehicle in a busy Manhattan intersection on Saturday night. Officials said Mr. Shahzad had discussed his contacts with the group, and investigators had accumulated other evidence that they would not disclose.
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Times Square Car Bomb
On Wednesday, Mr. Shahzad, the 30-year-old son of a retired senior Pakistani Air Force officer, waived his right to a speedy arraignment, a possible sign of his continuing cooperation with investigators.
As his interrogation continued, Department of Homeland Security officials directed airlines to speed up their checks of new names added to the no-fly list, a requirement that might have prevented Mr. Shahzad from boarding a flight to Dubai on Monday night before his arrest at Kennedy International Airport.