Police say the attacker was walking by three men who were speaking Cantonese on a street in Bensonhurst Tuesday night.
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The group of men, ages 51, 56, and 57, said he made fun of the way they spoke.
The 56-year-old victim confronted him about it and the attacker punched him in the face.
The video then shows the attacker taking out a knife and spraying the victims in the face with an unknown substance.
He then ran off on 20th Avenue.
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The three victims were taken to Maimonides Medical Center with minor injuries.
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