The above video was taken by a resident of Watertown, MA which is near Boston. The video would appear to show the shootout that occurred between Boston Police and two armed assailants.
There are reports that one suspect dead and the second suspect is at large.
This second suspect is to be considered armed and extremely dangerous. The Mass State Police have instructed all residents of Watertown to remain indoors and not answer the door for anyone but an identified police officer.
This information is still developing. However, official statements lead to the conclusion that the search for the Marathon bombing suspects has narrowed considerably.