An investigation into the collision has the QEW eastbound lanes closed between Cawthra and Hurontario for "a few hours," said Ontario Provincial Police spokesman Kerry Schmidt.
Police were pursuing a vehicle on the QEW that failed to stop and was then involved in a collision. The driver ran away on foot and police are looking for the driver.
Peel paramedics were called to the scene around 9 a.m. Saturday. They transported the officer to hospital and examined another person who was not transported.