Canadian national-security officials were presented with evidence that Indian consular staff operating in Vancouver supplied information to assist in the assassination of Sikh activist Hardeep Singh Nijjar, two sources told The Globe and Mail.

One of the Indian officials worked as a visa officer in the consulate, using his position to gather information about Mr. Nijjar from members of the Indian diaspora in Surrey, B.C., said the sources, one of whom is in law enforcement and one in national security.

Authorities believe the man, Kanwaljit Singh, was also an intelligence officer with India’s external intelligence agency, the Research and Analysis Wing, or RAW, the law-enforcement source said. The national-security source didn’t identify Mr. Singh by name but confirmed that CSIS was monitoring an undercover RAW agent posted to the consulate who was also working as a visa officer.