Canada's investigation into alleged Indian involvement in the assassination of a Sikh separatist in Vancouver last year is a "political compulsion", New Delhi's foreign minister said after three Indian citizens were arrested over the killing.
Canadian police on Friday arrested the trio for the murder of Hardeep Singh Nijjar, saying they were investigating their links to the Indian government, "if any".
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The killing sent diplomatic relations between Ottawa and New Delhi into a tailspin last autumn after Prime Minister Justin Trudeau said there were "credible allegations" linking Indian intelligence to the crime.
India vehemently rejected the allegations as "absurd", halting the processing of visas for a time and forcing Canada to significantly reduce its diplomatic presence in the country.
"It is their political compulsion in Canada to blame India," the Press Trust of India news agency quoted external affairs minister S. Jaishankar as saying on Saturday.
Thousands of people were killed in the 1980s during a separatist insurgency aimed at creating a Sikh homeland known as Khalistan, which was put down by security forces.
The movement has largely petered out within India, but in the Sikh diaspora -- whose largest community is in Canada, with around 770,000 people -- it retains support among a vocal minority.
New Delhi has sought to persuade Ottawa not to grant Sikh separatists visas or political legitimacy, Jaishankar said, since they are "causing problems for them (Canada), for us and also for our relationship".
He added that Canada does not "share any evidence with us in certain cases, police agencies also do not cooperate with us".
Nijjar immigrated to Canada in 1997 and acquired citizenship 18 years later. He was wanted by Indian authorities for alleged terrorism and conspiracy to commit murder.
The three arrested Indian nationals, all in their twenties, were charged with first degree murder and conspiracy.
They were accused of being the shooter, driver and lookout in his killing last June.
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The Canadian police said they were aware that "others may have played a role" in the murder.
In November, the US Justice Department charged an Indian citizen living in the Czech Republic with plotting a similar assassination attempt on another Sikh separatist leader on American soil.
A Washington Post investigation reported last week that Indian foreign intelligence officials were involved in the plot, a claim rejected by New Delhi.
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