A multi-vehicle pile-up was reported on Highway 400 near Barrie Thursday morning, prompting police officials to close both directions of the highway between Hwy 89 and Mapleview.
According to police, up to 100 vehicles may have been involved in the crash.
"No major injuries," OPP officials tweeted.
Stranded motorists urged to stay inside their vehicle with 4-ways on as OPP are responding to numerous calls.