Ten people were hospitalized with injuries, Hill said. Their conditions weren’t immediately clear, and they weren’t publicly identified.

The drivers were among the survivors, said Rob Lasson, who leads the RCMP’s major crimes unit.

Lasson said the bus was traveling southbound on Highway 5 around 11:40 a.m. and had already crossed the westbound lanes of the Trans-Canada Highway when the semi struck it. Highway conditions appeared clear at the time, he said.

It wasn’t clear who had the right of way, Lasson said. He added that investigators were working to determine whether a crime had occurred.

Speaking to CTV News, witnesses described a horrific scene, with vehicles in flames and rescue personnel trying to save survivors.