The suspect is described as in his 20s, having a light-brown skin tone and thin build, and was wearing a black shirt, black pants and red baseball cap.

Anyone who may have seen or heard anything in the area at the time is asked to contact police immediately. Investigators are also appealing to any nearby businesses or residences that may have video surveillance, or any drivers who may have dashcam footage from the area, to please come forward.

Police are also looking to speak to a male jogger who may have witnessed the incident. He is described as being of Asian decent, and in his 50s.

Anyone with information can contact the York Regional Police Special Victims Unit — Sexual Assault Section at 1-866-876-5423, ext. 7071, or Crime Stoppers at 1-800-222-8477. Tips can also be left anonymously online at www.1800222tips.com.

The trails are well travelled throughout the day, police said, and they advise residents to always be aware of their surroundings, to carry a phone, and to call police when they suspect anything suspicious.

Heavy police presence in the area, including YRP helicopter, general patrols and officers on ATVs patrolling in the trails, should be expected for the next couple of days as investigations continue.

This was the second York Region sexual assault incident in less than two weeks to be reported to police.

On the evening of June 21, a teenage girl was sexually assaulted in Newmarket by an unknown man. Investigators with YRP are looking for the suspect.

The two cases are not linked, James said.