Prime Minister Justin Trudeau said Wednesday that Ottawa would work to ensure a thorough investigation of a Ukrainian jetliner crash in Iran that killed dozens of Canadians. "This morning, I join Canadians across the country who are shocked and saddened to see reports that a plane crash outside of Tehran, Iran, has claimed the lives of 176 people, including 63 Canadians," Trudeau said in a statement. "Our government will continue to work closely with its international partners to ensure that this crash is thoroughly investigated, and that Canadians' questions are answered," he said. et/bfm/bgs