New York - Hundreds of federal agents and police officers widened their investigation of a potential terrorism plot involving an alleged al-Qaida associate on Wednesday. Investigators have fanned out in a New York City neighborhood to re-interview "people previously encountered" during previous raids there, and to locate others who know them, according to a law enforcement official familiar with the probe. The effort also includes a review of phone and other records that could link potential suspects to one another or identify new ones.