The US is “deeply concerned” over accusations by Canadian Prime Minister Justin Trudeau linking Indian government agents to the murder of a Sikh separatist leader in British Columbia in June, the White House said on Monday.

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“We are deeply concerned about the allegations referenced by Prime Minister Trudeau earlier today,” White House National Security Council spokesperson Adrienne Watson said in a statement.

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“We remain in regular contact with our Canadian partners. It is critical that Canada’s investigation proceed and the perpetrators be brought to justice,” the statement said.