Iran Plane Crash Victims Came From at Least Seven Countries

Sam Zokaei, a reservoir engineer for BP, was also killed, the company confirmed. Mr. Zokaei, an Arabic and Persian speaker who was on holiday in Iran, had been with BP for the past 14 years, according to his LinkedIn profile.

At a news conference, Prime Minister Justin Trudeau of Canada said his government would ensure that the incident was fully investigated. “Canadians have questions, and they deserve answers,” he said.

François-Philippe Champagne, Canada’s foreign affairs minister, said that he was in touch with the Ukrainian government and that he would keep Canadians informed as the situation became clearer. “Our hearts are with the loved ones of the victims, including many Canadians,” he wrote on Twitter.

The Canadian Ministry of Foreign Affairs has warned Canadians to avoid nonessential travel to Iran, citing “the volatile security situation, the regional threat of terrorism and the risk of arbitrary detention.”

“Canadians, particularly dual Canadian-Iranian citizens, are at risk of being arbitrarily questioned, arrested and detained,” the travel warning says. “Iran does not recognize dual nationality and Canada will not be granted consular access to dual Canadian-Iranian citizens. Canadian-Iranian dual citizens should carefully consider the risks of traveling to Iran.”

Transport Canada, the country’s transport ministry, said that Air Canada, the only Canadian air carrier that operates in the region, “had altered its routes to ensure the security of its flights into and over the Middle East.”

Megan Specia and Iliana Magra contributed reporting from London, and Tracy Sherlock from Vancouver.