India on Tuesday rejected Trudeau's allegations.

The White House is "deeply concerned" over allegations of possible involvement of Indian agents in the killing of a Khalistani terrorist in British Columbia earlier this year and encourages Indian authorities to cooperate with any investigation, White House national security spokesman John Kirby said on Wednesday.

Canadian Prime Minister Justin Trudeau announced on Monday that domestic intelligence agencies were actively working on credible charges blaming New Delhi-based agents for the shooting of 45-year-old Hardeep Singh Nijjar in June, Reuters reported.

However, India on Tuesday rejected Trudeau's allegations as "absurd" and "motivated by personal interests" and expelled a senior Canadian diplomat in response to Canada's expulsion of an Indian official in the matter.

The Ministry of External Affairs on Tuesday rejected Trudeau's comments, saying "such baseless allegations seek to divert attention from Khalistani terrorists and extremists who have been provided shelter in Canada and continue to pose a threat to India's sovereignty and territorial integrity".

Khalistani separatist leader Hardeep Singh Nijjar was shot dead by two gunmen in Canada on June 18.

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