Boston Marathon Explosions

May 1, 2013 - 3:34 PM
A Department of Homeland Security police officer patrols with his dog outside the Moakley Federal Courthouse in Boston, Mass., Wednesday, May 1, 2013. Three suspects were taken into custody in the Boston Marathon bombing case including two college friends of Dzhokhar Tsarneav, according to officials. (AP Photo/Charles Krupa)