Toronto police have released images of a suspect accused of committing an indecent act on a GO train on Tuesday.

Police say a man was on board a train on the Stouffville line at around 12:30 a.m. when he allegedly exposed his genitals and masturbated in front of a female passenger.

The man got off at Milliken GO station, police say.

He is described as being in his mid-50s, five-foot-eight, and weighing 160 pounds with a medium build, a light complexion, black hair, and a moustache.

Police say he was last seen wearing a black Nike hooded winter jacket, dark jeans, black winter boots, and sunglasses, and was carrying a black backpack and a black laptop bag.

Anyone who can identify the suspect and knows his whereabouts is asked to contact Toronto police at 416-808-4200 or Crime Stoppers anonymously at 416-222-TIPS (8477).