20-year-old arrested after throwing Molotov cocktail at Sam Altman's San Francisco home, OpenAI says

SAN FRANCISCO -- A man has been arrested for allegedly throwing a Molotov cocktail at the San Francisco home of OpenAI CEO Sam Altman, the company said.

No one was hurt, according to the San Francisco Police Department and OpenAI.

A dispatcher recording from the San Francisco Police Department describes the moment of the attack.

"Someone threw a Molotov cocktail slash sticky bomb at the gate of Sam Altman CEO of OPEN AI's residence."

Around 4 a.m., San Francisco police officers arrived at Altman's home in the city's Russian Hill neighborhood located near the crooked section of Lombard Street.

In a statement, SFPD said after the attack:

"The suspect then fled on foot. There were no injuries reported as a result of this incident."

About an hour later at 5 a.m., another emergency dispatch: "Security there's a subject threatening to burn down the building - security sees subject holding a jug, claims there's kerosene in it. White male, Latin all black clothing medium build - also with light silver."

This time, it is from Open AI's headquarters about a man a threatening to burn down the building.

SFPD officers recognized the suspect and detained the 20-year-old man. He has not been identified.

San Francisco Mayor Daniel Lurie was proud of law enforcement's fast response.

Altman is one of the San Francisco's major economic forces leading one of the biggest AI companies in the world.

Luz Pena: "Have you spoken to him?"

"I have not, but our teams have been in touch and will make sure that everything is settled on that front," said Mayor Lurie.

The San Francisco District Attorney's Office told ABC News that it could be next week until decisions are made on whether it's a local or federal case and charges are filed.

Sources briefed on the investigation told ABC News that investigators are trying to understand the incident and motive. It's not yet clear if it was a mental health incident, a disgruntled current or former employee or some form of domestic terrorism, the sources said.

The company said the situation is under control and there is no immediate threat to its offices.

"We deeply appreciate how quickly SFPD responded and the support from the city in helping keep our employees safe," OpenAI said in a statement. "We're assisting law enforcement with their investigation."

Hours after the attack, Altman responded to the incident in a lengthy blog post on Friday, in which he shared a photo of his family "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."

He said that amid debates on the Artificial General Intelligence industry, "we should de-escalate the rhetoric and tactics and try to have fewer explosions in fewer homes, figuratively and literally."

The SFPD's Special Investigations and Arson Units are leading the investigation, the company said. The FBI said it's aware of the incident and is working with San Francisco police.

ABC News' Emily Shapiro contributed to this report.