OPP say five people have been transported to hospital, following a head-on crash near Caledon.
The crash happened at around 5:30 p.m. on Monday along Highway 9 near Coolihans Sideroad. At least one person has been sent to hospital with critical injuries.
Highway 9 will remain closed between Airport Road and Humber Station Road, while the OPP technical traffic investigation unit probes the scene.
