ChatGPT-maker OpenAI has said it considered alerting Canadian police last year about the activities of a person who months later committed one of the worst school shootings in the country’s history.

OpenAI said last June the company identified the account of Jesse Van Rootselaar via abuse detection efforts for “furtherance of violent activities”.

The San Francisco tech company said on Friday it considered whether to refer the account to the Royal Canadian Mounted Police (RCMP) but determined at the time that the account activity did not meet a threshold for referral to law enforcement.

OpenAI banned the account in June 2025 for violating its usage policy.