This new video of the first Boston Marathon bomb blast depicts bravery amid chaos. Literally before the smoke clears from the devastating blast, police officers and others are shown rushing to the horrifying scene to aid the screaming victims. The second bomb can be heard exploding at the 0:20 second mark of the video, which only momentarily stops rescue efforts. One report noted that marathon runners who finished the race continued to run to a nearby hospital to give blood to victims.
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