The woman told police that the man in the video kicked and cursed at her when she stood near him.
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It happened Wednesday afternoon on a southbound number 7 train at the Junction Boulevard Station.
The man later began swinging a folding knife.
The woman was cut on the arm and got out at the 82nd Street station.
Despite the laceration she refused further medical attention.
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Police are asking for the public's help tracking down the suspect.
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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