The allegation of India’s involvement in the killing of a Sikh Canadian is based on surveillance of Indian diplomats in Canada, including intelligence provided by a major ally, a Canadian official familiar with the matter told The Associated Press on September 21.

The official said the communications involved Indian officials and Indian diplomats in Canada and that some of the intelligence was provided by a member of the “Five Eyes” intelligence-sharing alliance, which includes the U.S., Britain, Australia and New Zealand, in addition to Canada.

The official did not say which ally provided intelligence or give specific details of what was contained in the communications or how they were obtained. The official spoke on condition of anonymity because they were not authorized to discuss the matter publicly.

The Canadian Broadcasting Corporation first reported the intelligence.