The incident was reported on July 17 just before 7 p.m. near 16th Avenue and 77th Street.
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Two men approached the elderly victim from behind and slapped her in the face.
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When she tried to avoid further contact with the attackers, her shirt was lit with a match or lighter.
The victim was not seriously injured, but photos of her shirt show the burn marks from the flames.
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Anyone with information is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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