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The cop caught on video aiming his service weapon at bystanders during an arrest in Harlem was identified Saturday.

Risel Maritnez, of the 32nd Precinct anti-crime unit, is under investigation by the NYPD’s Internal Affairs Bureau, cops said.

A video shows Maritnez aiming his gun at the camera while struggling to arrest a suspect, Dayshawn Bettway, 21, in a public-housing building Thursday.