Police survey the scene after a deadly shooting at a mosque in Quebec City, Canada, during evening prayers Sunday. Six people were killed and eight others were wounded, some gravely. Two suspects were arrested.

QUEBEC CITY — A shooting at a Quebec City mosque during evening prayers left six people dead and eight others wounded in an attack that Canada’s prime minister called an act of terrorism. Police arrested two suspects.

More than 50 people were at the Quebec Islamic Cultural Centre when the shooting erupted Sunday night. Some of the wounded were gravely injured, Quebec provincial police spokesman Christine Coulombe said early today. The dead ranged in age from 35 to 70, she said, and 39 people were unharmed.

One suspect was arrested at the scene and another nearby in d’Orleans, and police said they did not believe there were other suspects. Police didn’t release names of the suspects or give a possible motive.

Prime Minister Justin Trudeau and Quebec Premier Philippe Couillard both characterized the attack as a terrorist act, which came amid heightened tensions worldwide over President Donald Trump’s travel ban on several Muslim countries.

“We condemn this terrorist attack on Muslims in a center of worship and refuge,” Trudeau said. “It is heart-wrenching to see such senseless violence. Diversity is our strength, and religious tolerance is a value that we, as Canadians, hold dear.

“Muslim-Canadians are an important part of our national fabric, and these senseless acts have no place in our communities, cities and country,” he said.

Canada is generally very welcoming toward immigrants and all religions, but the French-speaking province of Quebec has had a long-simmering debate about race and religious accommodation. The previous separatist government of the province called for a ban on ostentatious religious symbols such as the hijab in public.

In the summer of 2016 a pig’s head was left on the doorstep of the Quebec Islamic Cultural Centre in the middle of Ramadan, when Muslims fast from dawn to sunset. Practicing Muslims do not eat pork.

Trudeau had earlier reacted to Trump’s visa ban for people from some Muslim-majority countries by tweeting Saturday: “To those fleeing persecution, terror & war, Canadians will welcome you, regardless of your faith. Diversity is our strength #WelcomeToCanada.”