OpenAI CEO Sam Altman has apologised over his company’s failure to warn authorities about the concerning online activities of a teen who went on to commit one of Canada’s worst mass shootings.

Jesse Van Rootselaar, 18, went on a shooting spree in Tumbler Ridge, British Columbia, on February 10, killing eight people.

The victims included Rootselaar’s mother and half-brother, and five students at the remote community’s secondary school.

Rootselaar, who was born male but identified as female, died of a self-inflicted gunshot wound.

OpenAI said after the attacks that Rootselaar’s ChatGPT account had been flagged internally the previous June for misuse “in furtherance of violent activities”, resulting in its suspension.

The San Francisco-based AI company said at the time that it had not informed authorities because Rootselaar’s use of the chatbot had not met the threshold for posing a credible or imminent threat of harm to others.

In a letter shared on Friday by the Tumbler RidgeLines news site and British Columbia Premier David Eby, Altman acknowledged that OpenAI should have alerted law enforcement to Rootselaar’s suspension.

“I am deeply sorry that we did not alert law enforcement to the account that was banned in June. While I know words can never be enough, I believe an apology is necessary to recognize the harm and irreversible loss your community has suffered,” Altman wrote.

“I reaffirm the commitment I made to the Mayor and the Premier to find ways to prevent tragedies like this in the future,” Altman added.

“Going forward, our focus will continue to be on working with all levels of government to help ensure something like this never happens again.”

An OpenAI spokesperson confirmed the letter’s authenticity to Al Jazeera.

Altman’s statement of regret came after Eby said last month that the tech CEO had agreed to apologise to the Tumbler Ridge community over OpenAI’s failure to flag Rootselaar as a threat.

In his letter, Altman said Eby and Tumbler Ridge Mayor Darryl Krakowka had conveyed “the anger, sadness, and concern” being felt in the community in their discussions.

“We agreed a public apology was necessary, but that time was also needed to respect the community as you grieved. I share this letter with the understanding that everyone grieves in their own way and in their own time,” Altman wrote.

“I want to express my deepest condolences to the entire community. No one should ever have to endure a tragedy like this. I cannot imagine anything worse in this world than losing a child.” (Al Jazeera)

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