NEW YORK - (AP) - A law enforcement official says a man suspectedof trying to detonate a car bomb in Times Square over the weekenddid a dry run three days earlier.

The official says Faisal Shahzad drove anSUV to Times Square from Connecticut on April 28 and returned tothe scene April 30 to drop off a different vehicle. The officialsays he then went back the next day to leave the SUV with the carbomb but forgot the keys for both vehicles in the SUV and had totake public transit to get away.

Shahzad is believed to have been working alonewhen he began preparing the attack almost immediately afterreturning from his native land, authorities said Wednesday.

They said they have yet to find a wider link to extremistgroups.

Two new surveillance videos emerged of the bomb suspect, FaisalShahzad. Police told The Associated Press that one video shows himin a white baseball cap and a dark jacket walking away from thesmoking, bomb-laden Nissan Pathfinder parked in the bustling heartof New York City.

The second video shows him buying a weak batch of fireworks in astore in Pennsylvania, according to the shop's owner.

One law enforcement official told the AP that authorities don'tbelieve there are any other suspects in the plot and that severalarrests in Pakistan in the past two days were not related.

Shahzad faces terrorism and weapons charges after authoritiessaid he admitted rigging the Pathfinder with a crude bomb offirecrackers, propane and alarm clocks based on explosives traininghe received in Pakistan. Authorities said he was cooperating withinvestigators and did not appear in Manhattan federal court for asecond day.

New York Police Commissioner Raymond Kelly told a Senate panelthat Shahzad bought the gun found in his car at Kennedy Airport inMarch, when he appeared to move ahead on the bombing plot.

"It appears from some of his other activities that March iswhen he decided to put this plan in motion," Kelly said. "He cameback from Pakistan Feb. 3, 2010. It may well have been an indicatorof putting something catastrophic in motion."

Law enforcement officials in Washington said they had notverified statements investigators said Shahzad had made that he wastrained in Pakistan for the attack. All the officials spoke oncondition of anonymity to discuss the case.

The FBI was able to identify Shahzad's name because ofinformation Customs and Border Protection officials shared monthsearlier, according to a law enforcement official who spoke oncondition of anonymity to discuss the investigation.

To listen to audio of the control tower telling the airplane with the bomb suspect on it to return to the gate CLICK HERE