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And why this is a little bit out of the ordinary. >> reporter: why it's out of the ordinary. if you did have an officer shot, as we got the report earlier today, you would have a big police response. but what separates this, if it was related to a robbery, as we heard earlier in the evening, you wouldn't have people who are armed at the teeth as we have in this situation, at least, according to the scanner traffic. we have reports of hand grenades over the radio. we have reports of additional ieds, improvised explosive devices. a command for all police officers on the scene to power down their...

Is still considered to be at large, at least according to the scanner traffic... we are going fast and loose because the situation is developing right now. >> that sounds absolutely crazy, some of the things you are saying, power down your cell phones. this sounds like something much bigger than a robbery. can you walk us through? we know this started with a policeman at the m.i.t. campus, responding to something there and this escalated into this chase. can you walk us through where we are? >> reporter: that was it. we got reports of a shooting at the m.i.t. campus, 10 minutes by car away fro...

For anyone just joining us. this started on the campus of m.i.t., with the shooting of an m.i.t. campus police officer. can you tell us how things progressd? >> reporter: that was the 11:00 hour when the information crossed from the campus newspaper that an officer had been shot and it crossed the campus web site that an officer had been shot and the scene was coshedded. we had reports that the officer -- at some point, before or after he was shot, had his weapon stolen. and the information crossed that it was a simple robbery, unrelated to the bombing. at that point, a lot of media stood down...

Massachusetts, now, very close to boston. the proximity and the timings, all coming after the -- after the images of those individuals were released. >> is there anything else that you can tell us about that? because what you are describing seems like a pretty big operation, if it was just a simple robbery? >> reporter: it was a big operation. certainly the individuals, if all the scanner traffic proves to be accurate. certain individuals were strapped and armed. we have heard a discussion over the scanner about long weapons or long rifles appearing out here. you are talking about -- police co...

Commissioner. he slipped it out, if you will. i'm not sure that it was something the feds out there at this moment, but that this was a terrorist. as the commissioner said, they had come here to kill. and they are trying to explain right now to the people of watertown and those five or six other parts of boston, to stay inside because that suspect and terrorist is on the loose. i can recall, bill, when i first started following the scanner traffic on the police radio earlier this evening around, just around midnight when that black mercedes, an ls-50, was carjacked at the gas station. police s...