In pictures: Drama as Boston police exchange fire with bombing suspects

epa03667992 Police search neighborhoods yard by yard after a police chase and shootout with two heavily armed men shortly following the shooting of an MIT police officer just three days after the dual bombings at the Boston Marathon 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. EPA/MATT CAMPBELL *** Local Caption *** 03667992.jpg