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Prime Minister Stephen Harper took a swipe at Justin Trudeau on Wednesday after the new Liberal leader talked about the need “to look at the root causes” that led to this week’s terrorist attack in Boston.

In an interview with the CBC’s Peter Mansbridge that aired Tuesday night, Trudeau was asked how he would have responded to the attacks that killed three people and left about 170 injured.

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Trudeau said he would offer the American material support “and at the same time, over the coming days, we have to look at the root causes.”

“Now, we don’t know now if it was terrorism or a single crazy or a domestic issue or a foreign issue,” he said. “But there is no question that this happened because there is someone who feels completely excluded. Completely at war with innocents. At war with a society. And our approach has to be, where do those tensions come from?

“Yes, there’s a need for security and response,” Trudeau added. “But we also need to make sure that as we go forward, that we don’t emphasize a culture of fear and mistrust. Because that ends up marginalizing even further those who already are feeling like they are enemies of society.”