One person has been seriously injured in a multi-vehicle collision in North York. Toronto police say the collision occurred at the intersection of Arrow Road and Deerhide Crescent, south of Finch Avenue West, shortly before 9:30 p.m. One person was transported to the hospital with serious injuries, police say. Two others were also hospitalized with non-life-threatening injuries. It is not immediately known what the exact number of vehicles involved is. The cause of the collision is also unknown.