Faisal Shahzad Did Dry Run Of Times Square Bombing

The Pakistani-American accused of the failed Times Square car bombing is believed to have been working alone when he began preparing the attack almost immediately after returning from his native land, authorities said Wednesday.

They said they have yet to find a wider link to extremist groups.

He did a dry run three days before trying to detonate the car bomb, said a law enforcement official who spoke to the AP on Wednesday on condition of anonymity because of the sensitive nature of the investigation.

Shahzad drove the SUV to Times Square from Connecticut on April 28 apparently to figure out where would be the best place to leave it later, then returned to the area April 30 to drop off a different vehicle, a black Isuzu, the official said. He then went back Saturday to leave the SUV with the car bomb but forgot the keys for both vehicles in the SUV and had to take public transit back home, the official said.