Toronto police have released security images of a suspect after a woman was allegedly sexually assaulted at a playground on Sunday.

Around 11:20 p.m., the woman entered Felstead Avenue Playground near Danforth and Greenwood avenues.

It’s alleged that she was followed by a male, who exposed himself to her.

Police say that when the woman tried to flee, he chased her and sexually assaulted her.

A bystander saw what was happening and intervened. The alleged attacker then fled the area.

The suspect is described as between 15 and 25 years of age, approximately five-feet-nine-inches in height with a thin build. He is clean-shaven and was wearing a green plaid-patterned shirt and beige pants.

Anyone with information is asked to contact police at 416-808-7474.