Along with Watertown, Cambridge, Waltham, Newton, Belmont, and the entire MBTA system. They're telling everyone in these towns to stay inside with the doors locked, and only open for properly identified law enforcement officers. Nobody on the road, nobody on the street.
I guess you know the news, unless this is the first place you clicked when you woke up: two brothers from Chechnya are the bombing suspects, and one of them, Tamerlan Tsarnaev, 26, was killed in a shootout in Watertown last night; the other is still at large somewhere nearby. They shot and killed a policeman at MIT, and shot and seriously wounded an MBTA policeman. The suspect at large is Dzhokhar Tsarnaev, 19 years old. Last night, they still had and were using explosives.