CNN’s Anderson Cooper hosts an hourlong documentary about the Boston Marathon bombings Friday, and it features several of the powerful pictures shot by Boston Globe photographer John Tlumacki. (He took that dramatic photo of 78-year-old Bill Iffrig hitting the ground after the first bomb blast.) “Back to Boston – Moments of Impact,” airing at 10 p.m., tells the stories behind some of Tlumacki’s images. He and other photographers are interviewed by CNN’s Randi Kaye about capturing emotional moments in the midst of such a tragedy.
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