Carlos Arredondo, right, and his wife Melida react to the sound of a practice round from an artillery battery before the Boston Pops Fourth of July Concert at the Hatch Shell in Boston, Thursday, July... more 
Carlos Arredondo, right, and his wife Melida react to the sound of a practice round from an artillery battery before the Boston Pops Fourth of July Concert at the Hatch Shell in Boston, Thursday, July 4, 2013. The Arredondos were present when two bombs exploded at the finish line of the Boston Marathon. Carlos aided first responders in evacuating wounded spectators from the scene. (AP Photo/Michael Dwyer) less 
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Associated Press | Photo By Michael Dwyer
Thu, Jul 4, 2013 8:49 PM EDT