CALGARY -- Prime Minister Justin Trudeau says Canada is thinking of "our friends in France" and will work to fight terrorism.

"We had a terrible attack last night and our hearts go out to the victims and their families," Trudeau said Friday while in Calgary to attend the Stampede.

"Canada stands with France as a steadfast ally and we will work with the international community to fight terror to ensure that we live in a peaceful world."

At least 84 people were killed when a truck full of weapons plowed into a crowd of Bastille Day revellers in the French resort city of Nice late Thursday.

There were no reports of Canadian casualties.

Public Safety Minister Ralph Goodale said the federal government has no information that would necessitate a change in Canada's terror threat level, which is currently at medium.

Still, Goodale urged Canadians to stay vigilant and alert.

"Canadians can rest assured that when the security and intelligence sector receives credible warnings on a specific threat, they work with the appropriate government partners to ensure the safety of Canadians," Goodale said in a statement.

Goodale noted that while in Paris in January, he signed a declaration with his French counterpart, Bernard Cazeneuve, to work together on terrorism, organized crime and irregular migration.