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(Watertown, MA)  --  Armored vehicles and heavily armed police are descending on a location in Watertown, Massachusetts, in an effort to capture marathon bombing suspect Dzhokhar Tsarnaev.  Press have been told to back away from the area.  Tsarnaev has been on the run since yesterday, when the FBI posted a picture of him and his brother as suspects in the case.  The two led police on a high speed chase last night, and Tsarnaev's brother was killed in a shootout.