Indian Prime Minister Narendra Modi welcomes Canada Prime Minister Justin Trudeau upon his arrival at Bharat Mandapam convention center for the G20 Summit, in New Delhi, India, Sept. 9, 2023. 鈥 EVAN VUCCI/POOL VIA REUTERS//FILE PHOTO

NEW DELHI 鈥 Canadian Prime Minister Justin Trudeau said authorities were 鈥渁ctively pursuing credible allegations鈥 linking New Delhi鈥檚 agents to the murder of a Sikh separatist leader, a concern India dismissed as 鈥渁bsurd.鈥

The spat deals a fresh blow to diplomatic ties that have been fraying for years, with New Delhi unhappy over Sikh separatist activity in Canada. It now threatens trade ties too, with talks on a proposed trade deal frozen last week.

Each nation also expelled a diplomat in tat-for-tat moves, with Canada throwing out India鈥檚 top intelligence agent there while New Delhi responded by giving a Canadian diplomat five days to leave.

Any involvement of a foreign government in the killing of a Canadian citizen was 鈥渁n unacceptable violation of our sovereignty,鈥 Mr. Trudeau told the House of Commons in an emergency statement on Monday.

He was referring to Hardeep Singh Nijjar, 45, shot dead outside a Sikh temple on June 18 in Surrey, a Vancouver suburb with a large Sikh population, three years after India had designated him as a 鈥渢errorist.鈥

Mr. Nijjar supported a Sikh homeland in the form of an independent, so-called state of Khalistan in India鈥檚 northern state of Punjab, the birthplace of the Sikh religion, which borders Pakistan.

On Tuesday, India鈥檚 foreign ministry said it had given the Canadian diplomat five days to leave the country, without disclosing his name or rank.

鈥淭he decision reflects the government of India鈥檚 growing concern at the interference of Canadian diplomats in our internal matters and their involvement in anti-India activities,鈥 it said in a statement.

The ministry had summoned Cameron MacKay, Canada鈥檚 high commissioner, or ambassador, in New Delhi to notify him of the move, it added.

Earlier, New Delhi urged Ottawa to take action against anti-Indian elements in Canada.

鈥淎llegations of the government of India鈥檚 involvement in any act of violence in Canada are absurd and motivated,鈥 it said, adding that similar accusations made by Mr. Trudeau to Prime Minister Narendra Modi had been 鈥渃ompletely rejected.鈥

It said the 鈥渦nsubstantiated allegations鈥 sought to shift focus away from 鈥淜halistani terrorists and extremists who have been provided shelter in Canada.鈥

鈥楶ROMPT AND EFFECTIVE ACTION鈥
The ministry added, 鈥淲e urge the government of Canada to take prompt and effective legal action against all anti-India elements operating from their soil,鈥 the ministry said.

Mr. Trudeau said he had raised the matter directly with Mr. Modi on the sidelines of G20 summit in New Delhi on Sept. 9 and 10, and had urged his government to co-operate with Canada to resolve it.

Mr. Modi, in turn, conveyed strong concern to Mr. Trudeau over recent demonstrations in Canada by Sikhs calling for an independent state.

Canada has the largest population of Sikhs outside the Indian state of Punjab, with about 770,000 people reporting Sikhism as their religion in the 2021 census.

Khalistan is an independent Sikh state whose creation has been sought for decades. A Sikh insurgency killed tens of thousands of people in India in the 1980s and early 1990s before it was suppressed by tough security action.

However, New Delhi has been wary of any revival, with a particular focus on small groups of Sikhs in Australia, Britain, Canada and the United States, who support the separatist demand and occasionally stage protests outside its embassies.

The United States and Australia expressed 鈥渄eep concern鈥 over Canada鈥檚 accusations, while Britain said it was in close touch with its Canadian partners about the 鈥渟erious allegations.鈥

India has been particularly sensitive to Sikh protesters in Canada with some Indian analysts saying Ottawa does not stop them as Sikhs are a politically influential group there.

In June, India criticized Canada for permitting a float in a parade depicting the 1984 assassination of Prime Minister Indira Gandhi by her bodyguards, perceived to be glorification of violence by Sikh separatists.

Ottawa paused talks this month on a proposed trade treaty with India, just three months after both said they aimed to seal an initial deal this year.

Mr. Modi did not hold a two-way meeting with Mr. Trudeau at the G20 summit, despite similar meetings with other world leaders. Days earlier, metro stations in the Indian capital were vandalized with pro-Khalistan graffiti. Reuters