Toronto police  are looking for a man they believe is responsible for sexually assaulting a 22-year-old woman on Friday night.

Police say the woman was walking north on Highway 27 over the West Humber Trail Bridge, when she noticed a man following her.

The woman told police the man was walking his bicycle and quickened his pace to catch up to her. Once he caught up to her, the man blocked the woman's path and sexually assaulted her

He was last seen riding his bicycle down the West Humber Trail footpath.

He is described as having a light-brown complexion, 5'6", with a medium build, mid-to-late 20s, possibly with a chinstrap beard. He was wearing a red turban, a blue shirt with a logo on the chest, and spoke with a "raspy" voice.

Police are asking anyone with information to call them.