the lieutenant mark torre, the commanding officer of nypd bomb squad said the college student stepped on a shock set sensitive explosive device. they believe it was a homemade firework left in a plastic bag and it was discarded after a failed attempt set it off on friday. please say this rudimentary device created an isolated incident with no linked threat to nyc. they're looking at the device and investigation and will get results back tomorrow. as of right now golden is in stable condition. there is some press lined up behind me so he may be released today and of course all of our thoughts and prayers are with him to have a quick recovery. >> that is a pretty serious explosive device to take off of what because the amputation of everything below the knee. that is serious stuff. do not talking about fireworks here. >> the lieutenant alluded to was that the chemicals that were in the device are things that are readily available. anybody has knowledge of chemistry would have an ability and a google search engine and, would have the ability to put this together. it's too early to expect

pyro technician hobbyists, that's where i'm going with that. [ inaudible question ] >> lieutenant mark torre, commanding officer, bomb squad. >> that is a press conference by the new york police department. a young man earlier today, his foot severed by an explosion. he jumped off of rocks along with two of his friends and ended up severely injured. we just heard from the nypd, they don't think that this young man or his friends had anything to do with this. perhaps just in the wrong place at the wrong time it appears. i want to bring back now or cnn senior law enforcement analyst tom fuentes, also retired nypd detective harry houck, errol lewis, anchor for time warner cable news. so harry, this is interesting. i think maybe one of our questions has been answered, which is why are they not closing off the park? because this is sounding more like some sort of freak homemade fireworks accident than perhaps something even more nefarious or something that would be like a fashion ied, right? >> right, exactly. this happened at 11:00, right? we're talking six hours already since this happened. the