grif jenkins is is back in watertown. there is a local report from whdh which is the nbc station in boston who is interviewing a student near the campus there. he was on the third floor of the apartment building and explaining how much he saw the activity out of his window. many gun gunshots. he described a grenade being thrown and a pressure cooker bomb like we reported literally thrown at police officers. he described the explosion was something you would have heard on monday afternoon. that was his eyewitness account and we are reaching out to him to get him on the air now. grif, what do you have in watertown? >> that account may be a little confused. i bet it is not quite at mit. it is more here in watertown. as i was saying before and i apologize to our viewers, but we lost the signal. we came from mit to watertown about five miles away. i was giving chase to at least 40 or 50 police cars. i heard multiple gunshots and an explosion in this neighborhood which is a fluid situation. they are going door-to-door and resid

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drew grif fin investigating at

grif jenkins is in watertown, massachusetts. we have nighttime video of a man being forced on the ground and in handcuffs being taken away. were you there? is that the same man? what do you know about suspect number two from this video? >> from that video, we do not know. the authorities are not saying what connection, if any, that man had. as you can see from the video that i shot, we were quickly moved out of the perimeter because of the security issue. but let me just say this if i can, the last time i held a camera behind americans drawing guns going door to door with the level of gunfire and explosion that i witnessed was in fallujah in iraq. it was something here. it started at m.i.t. shortly after 10:00. it was the egress of the law enforcement. you see them still coming behind me in this scene in watertown. the egress, bill and everybody watching, the egress from the m.ism t. incident, that original shooting of the officer who tragically lost his life, the egress with every single police car full force. i got myself caug