A verified account with the @elonmusk handle also recently showed up on Instagram, as the billionaire prepares to take his rocket company SpaceX public.
China, the U.S., Russia and others have ramped up their contest over artificial-intelligence-backed weapons and military systems. The buildup has been compared to the dawn of the nuclear weapons age.
The device burned an exterior gate of the house, in San Francisco, the police said, and it was unclear whether the artificial intelligence executive was home. The authorities arrested a suspect.
The company said on Tuesday that it was holding back on releasing the new technology but was working with 40 companies to explore how it could prevent cyberattacks.