Boston Marathon Bombing Investigation Continues

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Watertown Police officer Brandon O'Neill holds a large American flag... News PhotoBestof,Bestpix,Candlelight,Conflict,Crime,Emergencies and Disasters,Flag,Holding,Horizontal,Justice - Concept,Law,Massachusetts,Police Force,Politics,Social Issues,Terrorism,Topics,Topix,USA,Vigil,Waist Up,Watertown - MassachusettsPhotographer Collection: Getty Images News 2013 Getty ImagesWATERTOWN, MA - APRIL 20: Watertown Police officer Brandon O'Neill holds a large American flag during a candlelight vigil at Victory Park on April 20, 2013 in Watertown, Massachusetts. A manhunt for Dzhokhar A. Tsarnaev, 19, a suspect in the Boston Marathon bombing ended after he was apprehended on a boat parked on a residential property in Watertown, Massachusetts. His brother Tamerlan Tsarnaev, 26, the other suspect, was shot and killed after a car chase and shootout with police. The bombing, on April 15 at the finish line of the marathon, killed three people and wounded at least 170. (Photo by Jared Wickerham/Getty Images)