An off-duty New York Police Department officer was beaten up by a motorcyclist after asking the man to slow down after he rammed into him, authorities said.

The victim, 52, was walking with his dog along East 90th Street near First Avenue on the Upper East Side in New York City on Tuesday at around 7 p.m. when he was clipped by a man driving recklessly on a green scooter, police said.

Motorcyclist

The suspect was caught on unreleased surveillance video driving recklessly on the Upper East Side in New York City on March 28. (NYPD)

When the victim asked the individual to slow down, the suspect allegedly began to strike him in the face with "a closed fist" causing the off-duty officers to "fall on the ground." 

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The assailant continued to beat the officer up while he was on the ground, before fleeing from the scene.

Suspect

The NYPD said that the victim, a 52-year-old man, was walking his dog near East 90th Street and First Avenue on the Upper East Side at around 7 p.m. when he saw the male suspect recklessly riding a green motorcycle. (NYPD)

The unidentified victim was taken to Cornell Hospital and is in stable condition, according to the NYPD.

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Screenshots from unreleased surveillance video show the male suspect, who is approximately 35 to 45 years of age, 5'8" tall, 200 pounds He was last seen wearing a gray hoodie, black pants, helmet and riding a green motorcycle.

Suspect

When the victim asked the motorcyclist to slow down, the suspect went over to the victim and struck him multiple times in the face with a closed fist, knocking the victim to the ground. (NYPD)

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Anyone with information in regard to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782). The public can also submit their tips by logging onto the Crime Stoppers website at https://crimestoppers.nypdonline.org/, on Twitter @NYPDTips.