Prime Minister Justin Trudeau says he "cannot imagine what these parents are going through" as they wait for news.
At least 14 people are reported to have died after a truck collided with a bus carrying a junior hockey team in western Canada.
Another 14 are said to be injured. The Royal Canadian Mounted Police said it happened late on Friday afternoon.
The bus was carrying the Humboldt Broncos, who play in the Saskatchewan Junior Hockey League, to the town of Nipawin for a playoff game.
"There have been multiple fatalities - our whole community is in shock," said the Broncos' president, Kevin Garinger.
"We don't know who has passed and we don't expect to know right away," he added. "We know that the coroner and their office need to do their work and let families know."
The bus was hit from the side by a transporter truck
President of the Nipawin Hawks, Darren Opp, said a transporter truck hit the side of the bus, describing it as a "horrible accident" and "very, very bad".
Prime Minister Justin Trudeau tweeted: "I cannot imagine what these parents are going through, and my heart goes out to everyone affected by this terrible tragedy, in the Humboldt community and beyond."