Boston police officers stand on Boylston Street near empty buses meant to transport runners who were instead diverted from the course following an explosion at the finish line, Monday, April 15, 2013, in Boston. (AP Photo/Michael Dwyer)

Associated Press
Boston police officers stand on Boylston Street near empty buses meant to transport runners who were instead diverted from the course following an explosion at the finish line, Monday, April 15, 2013, in Boston. (AP Photo/Michael Dwyer)
Boston police officers stand on Boylston Street near empty buses meant to transport runners who were instead diverted from the course following an explosion at the finish line, Monday, April 15, 2013, in Boston. (AP Photo/Michael Dwyer)
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