The victim is a 19-year-old man.
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The incident happened on a crosstown 23rd Street bus in Gramercy Park.
Police say the suspect seen in the video harassed the victim, followed him off the bus and punched him in the head.
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The suspect then jumped back on the bus, which continued westbound.
The 19-year-old suffered pain and bruising but refused medical attention.
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Police are asking for the public's help tracking down the man seen in the video.
Call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782). You can also submit tips by visiting the CrimeStoppers website at crimestoppers.nypdonline.org or by messaging on Twitter @NYPDTips.
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