An emergency responder and volunteers, including Carlos Arredondo in the cowboy hat, push Jeff Bauman in a wheel chair after he was injured in an explosion near the finish line of the Boston Marathon Monday, April 15, 2013 in Boston. At least three people were killed, including an 8-year-old boy, and more than 170 were wounded when two bombs blew up seconds apart. (AP Photo/Charles Krupa)

Associated Press
An emergency responder and volunteers, including Carlos Arredondo in the cowboy hat, push Jeff Bauman in a wheel chair after he was injured in an explosion near the finish line of the Boston Marathon Monday, April 15, 2013 in Boston. At least three people were killed, including an 8-year-old boy, and more than 170 were wounded when two bombs blew up seconds apart. (AP Photo/Charles Krupa)
An emergency responder and volunteers, including Carlos Arredondo in the cowboy hat, push Jeff Bauman in a wheel chair after he was injured in an explosion near the finish line of the Boston Marathon Monday, April 15, 2013 in Boston. At least three people were killed, including an 8-year-old boy, and more than 170 were wounded when two bombs blew up seconds apart. (AP Photo/Charles Krupa)
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