NEW YORK (CBSNewYork) — Police are looking for a man they say punched and then taunted a 5-year-old boy on the subway on Saturday.

Investigators said the suspect, identified as Ramon Thomas, walked up to the boy, who was riding the G train with his mother, and punched him in the face as the subway approached the Bergen Street station in Cobble Hill, Brooklyn.

g train assault suspect ii Police: Man Punches, Taunts 5 Year Old Boy Aboard G Train In Brooklyn

Alleged subway assailant last seen exiting the G train at Bergen Street. (NYPD)

The man then taunted the boy before deboarding the train and running off in an unknown direction.

The boy suffered bruising and swelling on the left side of his face and was treated at a nearby hospital.

Thomas, 25, has short black hair and a mustache. He’s approximately 6-foot and 160 pounds with a medium build and was last seen wearing an olive colored long-sleeved shirt, black jacket, black sneakers, and beige cargo pants according to police.

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 (74682). 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.