A 29-year-old man has been arrested on suspicion of starting the Pacific Palisades fire in Los Angeles that killed 12 people and destroyed more than 6,000 homes in January.
Justice department officials said evidence collected from Jonathan Rinderknecht's digital devices included an image he generated on ChatGPT depicting a burning city.
The blaze was sparked on 7 January near a popular hiking trail overlooking the wealthy coastal neighbourhood.
The Eaton Fire, ignited the same day in the Los Angeles area, killed another 19 people and destroyed about 9,400 structures. The cause of that fire remains unclear. Mr Rinderknecht will appear in court in Orlando, Florida, on Wednesday.
