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Special Operations officers train their guns on an apartment building as it is searched in Watertown, Massachusetts, USA 19 April 2013. Three people were killed and over 100 were injured when two bombs exploded on 15 April 2013 at the finish line of the marathon. The two suspects in the Boston Marathon bombings are brothers, aged 19 and 20, NBC News reported. Law enforcement officials told the broadcaster that the men, one of whom has been killed in a shootout with police, are of Chechen origin and have permanent resident status in the United States. EPA/CJ GUNTHER
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