Boston University student Joy Liu places a note at a memorial on the campus for Boston Marathon bombing victim Lu Lingzi in Boston Wednesday, April 17, 2013. Lu and two friends had been watching the Boston Marathon near the finish line. (AP Photo/Winslow Townson)
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.