Police are searching for a suspect who allegedly exposed himself and performed a sex act on a southbound F train in Brooklyn. 

The suspect, who is believed to be between 30 and 35 years old, 6 feet tall and 180-190 pounds allegedly performed the sex act on Jan. 6 in front of a victim before fleeing the train at the Fort Hamilton station, cops say. He was wearing a black jacket, gray sweatpants, a white ski cap and white sneakers. 

Anyone with information is asked to call Crime Stoppers at 800-577-TIPS.