i want to go now to nbc news' lester holt, live on the ground in watertown, les zbler mara, we're standing at the edge of the perimeter, 20-block perimeter, you heard the police and authorities here are warning people to stay inside, that one suspect, suspect number two, the white-hat suspect is still at large, they're telling people do not answer your door if there's a knock at your door, obviously, unless it's police, they don't know where this individual is, he apparently drove out of that shootout, crashed through the police barricade, they still believe that he's still in this perimeter, it's still a very active and dangerous crime scene, you'll recall during the press conference last night, they noted they thought they were armed and dangerous beyond the capability to create bombs. police certain certainly dealt with both tonight during that chase the suspects apparently throwing explosive devices out at them and the gunfire, they apparently were armed with quite a bit of fire power. people in that part of watertown being told to stay indoors right now. this is still a very active sc