Massachusetts State Police released footage of the thermal camera footage authorities used to locate Dzhokhar Tsarnaev in a boat in suburban Watertown, Mass.:
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Mass. police release thermal video
Shot from a police helicopter, the thermal video helped locate the wounded suspect on Friday
Published April 21, 2013 7:15PM (EDT)
By Alex Halperin
Alex Halperin is news editor at Salon. You can follow him on Twitter @alexhalperin.
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