Washington DC Security Tightened After Boston Marathon Bombings

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U.S. Secret Service and U.S. Park Police officers stand guard on... News PhotoCrime,Government,Guarding,Horizontal,International Landmark,Justice - Concept,Law,Pennsylvania Avenue,Police Force,Politics,USA,Washington DC,White House - Washington DCPhotographer Collection: Getty Images News 2013 Getty ImagesWASHINGTON, DC - APRIL 15: U.S. Secret Service and U.S. Park Police officers stand guard on Pennsylvania Avenue in front of the White House April 15, 2013 in Washington, DC. Security around the White House was tightened after two people are confirmed dead and at least 28 injured after at least two explosions went off near the finish line of the Boston Marathon. (Photo by Alex Wong/Getty Images)