A law enforcement official told The Associated Press Tuesday that the FBI had put Najibullah (Nah-JEEB'-ull-ah) Zazi (ZAH'-zee) under surveillance in connection with a suspected plot to make homemade bombs.
The official wasn't authorized to speak publicly and insisted on anonymity.
Zazi told The Associated Press in a Denver suburb that he had recently visited New York and knows he's under investigation. But he says he's innocent.
New York officials say the FBI and New York City police raided three homes early Monday searching for explosives and possible links to al-Qaida after tailing Zazi. There were no arrests.