A 78-year-old woman is fighting for her life after she was struck by a vehicle on Friel Street in downtown Ottawa on Thursday morning, and police are appealing for witnesses.

Officers were called to the scene at about 8:30 a.m. on Thursday, Oct. 15, after a collision between a vehicle and a pedestrian in the downtown core, the Ottawa Police Service said.

Ottawa Paramedics took the woman to hospital with critical injuries. She remains in life-threatening condition.

Police have not released further details about the circumstances of the crash, including the driver involved or whether any charges are being considered. The force's Fatal Collision Investigation Unit is handling the case.

Police asking for witnesses and video

Investigators want to hear from anyone who witnessed the collision and has not yet spoken with police. They are also asking anyone with dashcam or other video footage of the incident to come forward.

Anyone with information can contact the Ottawa Police Service Fatal Collision Investigation Unit at 613-236-1222, extension 2345.

Tips can also be made anonymously by calling Crime Stoppers toll-free at 1-800-222-8477 or online at crimestoppers.ca.

Other ways to help

The police service is also encouraging residents to register their information and security camera locations at CAMSafe.ca, a program that helps investigators find nearby footage after incidents like this one.

Members of the public can view and download data released by the Ottawa Police Service through its Community Safety Data portal at data.ottawapolice.ca.