An afternoon subway ride turned violent when a passenger was assaulted after telling a fellow straphanger he stepped on his foot, police say.

The attack occurred on a southbound R in Brooklyn around 3:45 p.m. on Friday, October 20th. The NYPD says the victim, a 30-year-old male, and the male suspect were on the train when the suspect stepped on the victim's foot. According to police, "When the victim confronted the individual, the individual did punch the victim in the face. As a result of being punched in the face, the victim fell to the ground, while on the ground the individual did kick and punch the victim in the head and face."

By the time the train got to the 4th Avenue and 36th Street station, the suspect fled and took a southbound D train.

The victim was taken to Lutheran Hospital in critical but stable condition.

Police released an image of the suspect, describing him as 17-19 years old, 5'10" and 160 pounds, and last seen wearing a white t-shirt, black jeans, white sneakers, and a black book bag.

Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 800-577-TIPS 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 texting their tips to 274637(CRIMES) then enter TIP577.