Federal law enforcement officials accuse 29-year-old Jonathan Rinderknecht of lighting a fire on New Year’s Day that was initially extinguished by fire crews, but continued to smolder underground before reigniting during high winds, acting U.S. Attorney Bill Essayli said during a news conference.

Rinderknecht was arrested in Florida on Tuesday and is due to appear in court Wednesday. He faces charges including malicious destruction by means of a fire. Aisha Nash, the federal public defender assigned to represent Rinderknecht, has not responded to Associated Press requests for comment.

Rinderknecht fled the scene of the original fire, but returned to the same trail to watch it burn, Essayli said.

“He left as soon as he saw the fire trucks were headed to the location. He turned around and went back up there. And he took some video and, and watched them fight the fire,” Essayli said

Rinderknecht also made several 911 calls to report the fire, according to a criminal complaint.

During an interview Jan. 24, Rinderknecht told investigators where the fire began, information not yet public and that he would not have known if he hadn’t witnessed it, the complaint said.

He lied about his location, claiming he was near the bottom of the hiking trail, Essayli said.

The suspect was visibly anxious during that interview, according to the complaint. His efforts to call 911 and his question to ChatGPT about a cigarette lighting a fire indicated he “wanted to preserve evidence of himself trying to assist in the suppression of the fire and he wanted to create evidence regarding a more innocent explanation for the cause of the fire,” the complaint said.

Investigators determined the Jan. 1 fire was intentionally lit, likely by a lighter taken to vegetation or paper, according to the criminal complaint. They excluded other possibilities, including fireworks, lightning and power lines. Authorities also looked into whether a cigarette may have caused the fire, but concluded that was not the cause, the complaint says.

Investigators found a “barbecue-style” lighter inside the glove compartment of Rinderknecht’s car on Jan. 24. It appeared to be the same lighter as one that was in his apartment on Dec. 31, based on a photo on his phone. He admitted to bringing a lighter with him when he walked up the hill.

The blaze, which erupted on Jan. 7, killed 12 people and destroyed more than 6,000 homes and buildings in the Pacific Palisades, a wealthy coastal neighborhood of LA. The fire ripped through hillside neighborhoods, destroying mansions with spectacular views of the ocean and downtown LA.

Investigators still haven’t determined the cause of a second blaze called the Eaton Fire, which broke out the same day in the community of Altadena and killed 18 people.

Both fires burned for days, reducing block after block of entire neighborhoods to gray and black debris.

An outside review released in September found that a lack of resources and outdated policies for sending emergency alerts led to delayed evacuation warnings.

The report commissioned by Los Angeles County supervisors said a series of weaknesses, including “outdated policies, inconsistent practices and communications vulnerabilities,” hampered the county’s response.

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Seewer reported from Toledo, Ohio. Associated Press reporter Eric Tucker in Washington, D.C., contributed.