The allegations have prompted tit-for-tat expulsions of diplomats on both sides.

A photograph of late temple president Hardeep Singh Nijjar is seen on a banner outside the Guru Nanak Sikh Gurdwara Sahib in Surrey, British Columbia, on Monday, Sept 18, 2023, where temple president Hardeep Singh Nijjar was gunned down in his vehicle while leaving the temple parking lot in June. (Photo: AP/Darryl Dyck/The Canadian Press)

Accusations linking the Indian government to the killing of a Sikh separatist leader on Canadian soil have dealt a blow to diplomatic ties between Canada and India, but the tensions have been simmering for some time, said observers on Tu...