Daniel Moreno-Gama, 20, remained in San Francisco County Jail as the search in Spring, about 40 miles north of Houston, was underway.
The FBI confirmed to the San Francisco Chronicle that agents were serving a search warrant in Spring, but provided no further details.
Moreno-Gama had no criminal history in Harris County or Texas, according to public records, the Houston Chronicle reported. The Houston Chronicle and San Francisco Chronicle are both owned by Hearst.
San Francisco police said Moreno-Gama threw the firebomb at Altman’s Russian Hill home just before 4 a.m. on Friday before threatening to burn down OpenAI’s Mission Bay headquarters about an hour later. He was arrested soon after.
He was booked into jail on suspicion of attempted murder, making criminal threats and possession of a destructive device. No charges were announced as of Monday morning as the investigation continued.
Security personnel extinguished a fire at Altman’s home, and no one was injured.
A person identified as Moreno-Gama wrote widely online about concerns over AI, which he described as an existential risk. He said he was concerned that AI would lead to the extinction of humanity, because AI machines were not aligned with the best interests of humans. He also wrote that leaders of tech companies “appeared to lack strong morals.”
In a blog post published after the fire Friday, Altman suggested the attack was possibly connected to broader tensions and debate over AI. “While we have that debate, we should de-escalate the rhetoric and tactics and try to have fewer explosions in fewer homes, figuratively and literally,” Altman wrote.
St. John Barned-Smith contributed to this report.