Shannon Walsh, 15, places flowers on a memorial to Boston Marathon bombing victim, Martin Richard, 8, near the Richard family house in the Dorchester neighborhood of Boston, Wednesday, April 17, 2013. (AP Photo/Michael Dwyer)
Gallery: Bombing investigations and memorials
Apr. 17, 2013 @ 02:17 PM
BOSTON -- Investigators combed through the scene of Monday's explosions in Boston the victims were remembered with memorials and vigils.