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Forty-one Canadian diplomats have recently left India amid a rift over the murder of a Sikh leader on Canadian soil.
India asked Canada two weeks ago to withdraw dozens of its diplomatic staff and threatened to remove their immunity if they remained.
Relations have been tense after Canada said India may have been behind the 18 June killing of Hardeep Singh Nijjar.
India has denied the allegations, calling them "absurd".
On Thursday, Canada's foreign minister, Melanie Joly, confirmed that many Canadian diplomats in India have now left the country.
She said India had said that immunity for "all but 21 diplomats" will be "unilaterally removed" by 20 October.
Ms Joly added that the remaining 21 diplomats are still in India, but the withdrawal means Canada will have to limit its services in the country due to a shortage of staff.
Specifically, the move will put a pause on in-person operations in Bangalore, Mumbai, and Chandigarh, Ms Joly said.
She added services will still be available out of the High Commission of Canada in Delhi.
Canada had many more diplomats in Delhi than India has in Ottawa, and since the row between the two countries erupted, India asked Canada for parity in its diplomatic missions.
India saying it would remove diplomatic immunity for Canadian envoys is a "violation of international law", Ms Joly during a news conference in Ottawa.
She said Ottawa will not be reciprocate.
Officials said they still welcome Indian nationals who want to visit or move to Canada.