Pictures of manhunt for Boston bombing suspects

Police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. <span class=meta>(AP Photo/Charles Krupa)</span>
April 19, 2013 8:16:21 AM PDT