[img]http://d.yimg.com/a/p/rids/20100505/i/ra2392943073.jpg?x=130&y=85&q=85&sig=nftluQMvGM8ZYMOfNVIqqg--[/img]AP - 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.