Surveillance video shows a man grabbing a chair off the street at 370 W. 58th Street near 9th Ave and hurling it at a 66-year-old man.
It happened Friday around 10:30 p.m.
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The force of the blow was so hard, the victim suffered a broken arm.
The victim also dropped his cell phone during the attack.
The suspect grabbed it and ran off.
Police are asking for the public's help tracking down the suspect.
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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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