FILE - In this Sept. 25, 2009 file photo provided by the New York City Police Department, Najibullah Zazi, center, is escorted off an NYPD helicopter by U.S Marshals after being extradited from Denver, Colo. Zazi admitted Monday, Feb. 22, 2010 to a plot to bomb the New York City subways, saying he agreed... (AP Photo/New York City Police Department, File)