President Trump called Canadian Prime Minister Justin Trudeau on Monday to express his sympathies for an attack on a Quebec City mosque.

“President Trump expressed his condolences to the prime minister and people of Canada following the tragic shooting at the Centre Culturel Islamique de Québec,” Trudeau’s office said in a statement, according to the Toronto Star.

Trump also “offered to provide any assistance as needed.”

White House press secretary Sean Spicer confirmed the call on Monday, calling the massacre "another senseless act of violence that cannot be tolerated."

At least six people were killed and eight others injured in Sunday's massacre.

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Canadian authorities have labeled the shooting an act of terrorism. One suspect has been taken into custody, according to police.

Police have not established a motive for the shooting, which happened during evening prayers.

The attack took place amid worldwide tensions sparked by Trump’s decision to suspend refugee admissions to the U.S. and temporarily ban entry to people from seven predominantly Muslim nations.

In response to the policy, Trudeau said refugees from around the world were welcome in Canada.

“To those fleeing persecution, terror & war, Canadians will welcome you, regardless of your faith. Diversity is our strength #WelcomeToCanada,” he tweeted Saturday.

To those fleeing persecution, terror & war, Canadians will welcome you, regardless of your faith. Diversity is our strength #WelcomeToCanada — Justin Trudeau (@JustinTrudeau) January 28, 2017

--This report was updated at 1:47 p.m.