Hamilton Police are investigating a sexual assault on Hillside Trail.
The incident happened just after 9. p.m. Monday between Osler Drive and Meadow lane.
Police say a female was jogging when a male grabbed her and forced her to the ground where she was assaulted.
Once the victim was released she fled northbound along the trail.
The suspect is described as a white male, 6 feet tall, heavy set weighing approximately 200 to 250 pounds.
Anyone with more information is asked to call Crime Stoppers.