Officials have said that the death toll in Mayotte, currently at 35, could end up in the thousands. But in the capital, there were no scenes of public mourning and little talk of searches for missing loved ones.
Canadian ministers will convene a meeting with the police to discuss antisemitism, after attacks at Jewish establishments in Toronto and Montreal this week.
The leader of the party that supported Prime Minister Justin Trudeau's Liberal Party vowed to bring down the government, saying Mr. Trudeau had failed Canada.
Samuel Paty, a teacher, was beheaded in 2020 by an Islamist extremist after showing caricatures of the Prophet Muhammad to his students to illustrate free speech.
It was not the first online intervention by Elon Musk, the entrepreneur and adviser to Donald Trump, on behalf of once-fringe anti-immigrant parties in Europe.