A subway rider allegedly attacked a fellow straphanger because he thought he was bumped as they were getting onto a D train. Police are currently looking for the assailant.

The incident took place on May 8th, around 3:20 p.m. on a southbound D train. According to the NYPD, the suspect accused a 55-year-old man "of bumping into him as they boarded the train. The individual punched the victim in the face, placed him in a headlock and repeatedly rammed his head against the inside of the train."

The suspect left the train at the East 167th Street station, fleeing northbound on Grand Concourse. The victim was treated at Lincoln Hospital for numerous lacerations on his head .

Police released a surveillance image of the suspect, describing him as being 35 to 45 years old, 5'8"-5'9" and 170 pounds, with hair in dreadlocks. He was last seen wearing a white long sleeved shirt, black slacks, black shoes and he had on a black backpack.

Anyone with information in regards 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 WWW.NYPDCRIMESTOPPERS.COM or by texting their tips to 274637 (CRIMES) then enter TIP577. All calls are strictly confidential.