A 20-year-old man was arrested for allegedly throwing a Molotov cocktail at OpenAI CEO Sam Altman’s Russian Hill home early Friday. Daniel Alejandro Moreno-Gama was booked into San Francisco County Jail Friday afternoon on suspicion of attempted murder, arson, possession or manufacture of an incendiary device, and other charges.

Around 3:40 a.m., the suspect threw a bottle containing a flaming rag at the metal gate of the home on Chestnut St., according to a police report.

Security guards at the property extinguished the fire, and the incident was captured on surveillance cameras. The Standard has obtained the photo and blurred his face until conclusive identification can be made.

Shortly afterward, security personnel at OpenAI’s headquarters in Mission Bay made contact with a person matching the suspect’s description, according to the company. The individual made threatening statements about the building and was taken into custody by police.

No injuries were reported in either incident.

The San Francisco Police Department confirmed (opens in new tab) that the suspect was detained outside OpenAI’s Third Street offices after allegedly threatening to burn down the building. Responding officers recognized the man as the suspect caught on camera throwing a Molotov cocktail at Altman’s home.

Altman published a blog post (opens in new tab) Friday afternoon with a photo of his husband and their child.

“Here is a photo of my family. I love them more than anything,” he wrote. “I am sharing a photo in the hopes that it might dissuade the next person from throwing a Molotov cocktail at our house, no matter what they think about me.”

Altman purchased the five-and-a-half-bath home and adjoining lots on Lombard St. in January 2025. That purchase was made through an affiliate managed by his cousin Jennifer Serralta. In March 2020, Altman bought another Lombard St. property for $27 million; at the time, it was the city’s most expensive residential listing.

“We deeply appreciate how quickly SFPD responded and the support from the city in helping keep our employees safe,” OpenAI spokesperson Jamie Radice said. “The individual is in custody, and we’re assisting law enforcement with their investigation.”

This is only the most recent attack or threat of violence made against the company and its leader. In November, threats from a 27-year-old anti-AI activist prompted the lockdown of OpenAI’s San Francisco offices.

Sam Kirchner, whose whereabouts have been unknown since Nov. 21, was in the midst of a mental health crisis when he threatened to go to the company’s offices to “murder people,” according to callers who notified police that day.

Two callers who said they were familiar with Kirchner told the SFPD that he had previously expressed a desire to buy high-powered weapons to “fulfill these violent wishes,” according to a Nov. 21 bulletin sent to officers.

In a note to employees Friday, OpenAI said there was no immediate threat to staff or its offices but advised that there would be increased police and security presence at its Mission Bay campus.

This is a developing story and will be updated.