A man has been arrested after throwing a Molotov cocktail at the San Francisco home of OpenAI CEO Sam Altman in the early hours of Friday morning, police and the company confirmed. No injuries were reported in the incident, which occurred just after 4:00 am local time, though OpenAI declined to say whether Altman was present at the property at the time. The attack on the head of one of the world's most prominent artificial intelligence companies — the organisation behind the widely used ChatGPT chatbot — is likely to heighten concerns about the personal security of leading figures in the technology sector.