Massachusetts State Police patrol with a bomb sniffing dog before rehearsal for 

Massachusetts State Police patrol with a bomb sniffing dog before rehearsal for the Boston Pops Fourth of July concert at the Hatch Shell in Boston, Wednesday, July 3, 2013. The concert is city's first large public gathering since the Boston Marathon bombings. (AP Photo/Michael Dwyer)
Associated Press
Massachusetts State Police patrol with a bomb sniffing dog before rehearsal for the Boston Pops Fourth of July concert at the Hatch Shell in Boston, Wednesday, July 3, 2013. The concert is city's first large public gathering since the Boston Marathon bombings. (AP Photo/Michael Dwyer)
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