and wound up entering Times Square by driving south down Seventh Avenue . The source said Shahzad told investigators he turned right onto 45th Street toward Eighth Avenue because he saw a place to pull over . It 's unclear why Shahzad left the Pathfinder 's engine running and hazard lights blinking . But because of an incredible goof , Shahzad could n't use his escape car . He had accidentally left the keys to that vehicle in the Pathfinder that he thought was about to blow up , the source said . He apparently went to a train station , where he boarded a Metro North train back to Connecticut . Another law enforcement source said investigators found a train receipt used by Shahzad that is stamped about 7 p.m. , a half hour after a witness notified authorities that the car in Times Square was filing with smoke . Sources say investigators believe he ran to catch the train that pulled out around 7 or 7:15 Saturday night . The source added that police investigators have discovered a surveillance video of Shahzad walking in Shubert Alley -- which runs between 44th and 45th Streets just west of Broadway
New York -LRB- CNN -RRB- -- Faisal Shahzad made a practice run in Manhattan the day before he allegedly tried to blow up a car bomb in Times Square , according to a law enforcement source with knowledge of his questioning . Last Friday , Shahzad drove his white Isuzu from Connecticut through Times Square , where he staked out potential locations for the following night 's planned attack , the source said . He then parked the Isuzu several blocks away from Times Square , though the precise location was unclear , and took a train back to Connecticut , the source said . On Saturday night , with his recently acquired Nissan Pathfinder loaded with his makeshift explosives , Shahzad drove southbound along Manhattan 's East River on FDR Drive to the 49th Street exit , the source said . Shahzad then pulled over and reached into the Pathfinder 's rear compartment where he attempted to set into motion the process needed to set off the homemade bomb , the source said . The source , who did not explain how Shahzad had attempted to set off the bomb , said he then took a number of turns