FILE - Scenes from the Boston Marathon bombings are displayed on an outfield screen before a baseball game between the Boston Red Sox and the Kansas City Royals in Boston, Saturday, April 20, 2013, five days after the blasts. In just a four-month span, New England has been the backdrop for two incidents of mass carnage - the Dec. 14, 2012 shootings in Newtown, Conn., that killed 20 children and six staff members at Sandy Hook Elementary School and the Boston Marathon bombings on April 15, 2013 that killed three people and injured more than 260. (AP Photo/Michael Dwyer, File)

Associated Press
FILE - Scenes from the Boston Marathon bombings are displayed on an outfield screen before a baseball game between the Boston Red Sox and the Kansas City Royals in Boston, Saturday, April 20, 2013, five days after the blasts. In just a four-month span, New England has been the backdrop for two incidents of mass carnage - the Dec. 14, 2012 shootings in Newtown, Conn., that killed 20 children and six staff members at Sandy Hook Elementary School and the Boston Marathon bombings on April 15, 2013 that killed three people and injured more than 260. (AP Photo/Michael Dwyer, File)
FILE - Scenes from the Boston Marathon bombings are displayed on an outfield screen before a baseball game between the Boston Red Sox and the Kansas City Royals in Boston, Saturday, April 20, 2013, five days after the blasts. In just a four-month span, New England has been the backdrop for two incidents of mass carnage - the Dec. 14, 2012 shootings in Newtown, Conn., that killed 20 children and six staff members at Sandy Hook Elementary School and the Boston Marathon bombings on April 15, 2013 that killed three people and injured more than 260. (AP Photo/Michael Dwyer, File)
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