Toronto police are investigating after an alleged gang sexual assault on a 13-year-old girl Friday night.

The teen was at an all-ages party near Kipling and Finch avenues when, around 11:30 p.m., a man allegedly pulled her into a storage closet.

Police say four men proceeded to sexually assault the girl, but when a security guard caught them in the act, they fled.

The suspects are all black and 16 years old. One is six feet tall and was wearing a grey toque; a second is five feet eight inches tall, with short, curly hair, and was clean-shaven and wearing green; another was wearing a black leather jacket.

Anyone with information is asked to contact police at 416-808-7400, Crime Stoppers anonymously at 416-222-TIPS (8477), online at www.222tips.com, text TOR and your message to CRIMES (274637), or leave a tip on Facebook.