Ontario Provincial Police are confirming one person is dead after a crash between two tractor-trailers and a Greyhound bus Wednesday morning.

It happened about 4:30 a.m. on Highway 7 just east of Kaladar.

Police say a tractor trailer pulled out to pass the bus when it slammed into another trailer travelling in the opposite direction.

The tractor trailers collided and one of them then hit the bus.

Three other people were taken to hospital.

The highway is closed between Highways 41 and 38 while police investigate.