the new york city police officer on mounted patrol clears a block while the explosion might have been imminent. great bravery on his part. no suspects are in custody. they are combing through surveillance videos from nearby buildings looking for clues. homeland security secretary janet napolitano said this morning that investigators are treating the new york car bomb incident as potential terrorist attack. we have former c.i.a. director james woolsy. we want to know how the intelligence community including the c.i.a. might dive in a case like this. >> it could be a solo person like unibomber did but only using a car. or it could be like major hasan who exchanged 18 e-mails with al-awlaki in yemen, the islamic fanatic. and pie appears, we don't know for sure yet, inspired from