SAN FRANCISCO (VINnews) — Authorities in San Francisco arrested a 20-year-old man Friday after he allegedly threw a Molotov cocktail at the home of Sam Altman, the chief executive of OpenAI.

Police said the device sparked a small fire at an exterior gate of the property in the early morning hours. No injuries were reported, and officials said it was unclear whether Altman was at home at the time.

Investigators said the suspect fled on foot but was later found near OpenAI’s offices, where he was detained after allegedly making additional threats. Authorities said charges were being prepared.

OpenAI notified employees of the incident and indicated security would be increased at its facilities.

Altman, who co-founded the company in 2015, leads one of the world’s most prominent artificial intelligence firms. The company and its leadership have faced growing public scrutiny and protests in recent years over concerns about the impact of A.I. technology.

The case remains under investigation.