Somerville, Mass. firefighter Earl Johnson places flowers at a makeshift memorial on the front of fire station Engine 33, Thursday, March 27, 2014, in Boston. Fire station Engine 33 was the station of fallen firefighters Lt. Edward J. Walsh and Michael R. Kennedy who lost their lives fighting a 9-alarm fire in a four-story brownstone in Boston's Back Bay neighborhood Wednesday, March 26, 2014. (AP Photo/Steven Senne)

Boston Marathon bombing remembrance

Survivors, first-responders and public officials have observed a moment of silence near the Boston Marathon finish line to mark the moment t…

Boston bombing

Photos: Boston bombing then and now

A year after three people were killed and more than 260 injured when two bombs went off near the finish line of the Boston Marathon on April…