A timeline of the hunt for the Boston bombing suspects
Posted: April 19, 2013 - 9:52am

Police officers walk near a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke)
BOSTON (AP) — Key moments related to the search for the Boston Marathon bombing suspects, based on reports from the Middlesex County district...