Police are asking for tips after a female jogger on the east Mountain's rail trail was followed by a masturbating bike rider.

She accessed the trail between Limeridge and Mount Albion roads around 2 p.m. on Wednesday when she spotted the man, who seemed to be following her.

As she continued along the trail, walking, the tracker kept following her for about two hours, police said. She turned around at one point and saw the man masturbating with his genitals out in the open.

He was last seen near the Kenilworth Avenue stairs at Kimberly Drive, police said.

The rider is described as a white man in his 20s with short, red hair and scruffy, red facial hair. He's about five-foot-six and 130 pounds. He was wearing a green T-shirt, black track pants and a green and brown camouflage backpack.

His bike was red with the word "Triumph" on its frame.

Police ask that anyone with information about the suspect to call the east end detectives at 905-546-2907, or to offer tips anonymously through Crime Stoppers at 1-800-222-8477 www.crimestoppershamilton.com