Derrick Ward and Matthew Stabley, NBC Washington, May 26, 2015

D.C. police are looking for a man who knocked another man out with one punch in an apparent robbery May 17 in Southeast.

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Surveillance video from nearby Petey Greene Community Center shows the man in a red shirt punch the 63-year-old victim, dropping him to the ground. He stepped away from the motionless victim before returning, bending over him, and apparently going through his pockets and taking a dollar.

Several other people seen in the video did nothing to intervene or assist the victim.

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