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The head of the truck company involved in the crash, Day & Ross, said they will fully cooperate with the investigation and "offer any assistance and support that we can."

"All of us at Day & Ross are heartbroken by the tragic news out of Manitoba this afternoon," Day & Ross CEO William Doherty said in a statement to CTV. "The thoughts of the entire Day & Ross team are with those who have lost loved ones in this terrible incident, and we are holding out hope that those injured will recover."

Steve Lambert/The Canadian Press via AP
A major collision has closed a section of the Trans-Canada Highway near Carberry, Manitoba, June 15, 2023.
Steve Lambert/The Canadian Press via AP

Canadian Prime Minister Justin Trudeau called the news of the crash "incredibly tragic."

"I'm sending my deepest condolences to those who lost loved ones today, and I'm keeping the injured in my thoughts," he tweeted. "I cannot imagine the pain those affected are feeling -- but Canadians are here for you."

ABC News' Aleem Agha and Ellie Kaufman contributed to this report.