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Associated Press
FILE - In this April 22, 2013, file photo, Boston Police Commissioner Edward Davis salutes the American flag during a ceremony at the blast site on Boylston Street between Dartmouth and Exeter Streets near the Boston Marathon finish line in Boston. Davis will tell a lawmakers in a hearing on Washington on May 9 that government should tighten security around celebratory public events and consider using more undercover officers and technology, including surveillance cameras _ but only in ways that don’t run afoul of civil liberties. (AP Photo/Robert F. Bukaty, File)

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