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The blast gutted the American Reproductive Centers fertility clinic and shattered the windows of nearby buildings along a palm tree-lined street. Witnesses described a loud boom followed by a chaotic scene, with people screaming in terror and glass strewn along the sidewalk and street.

Investigators said Barktus died in the blast, which a senior FBI official called possibly the “largest bombing scene that we’ve had in Southern California.” A body was found near a charred vehicle outside the clinic.

Bartkus attempted to livestream the explosion and left behind writings that communicated “nihilistic ideations” that were still being examined to determine his state of mind, said Akil Davis, the assistant director in charge of the FBI’s Los Angeles field office. U.S. Attorney Bilal “Bill” Essayli, the top federal prosecutor in the area, called the message “anti-pro-life.”

“This was a targeted attack against the IVF facility,” Davis said Sunday. “Make no mistake: we are treating this, as I said yesterday, as an intentional act of terrorism.”

The bombing injured four other people, though Davis said all embryos at the facility were saved.

“Good guys one, bad guys zero,” he said.

Authorities were executing a search warrant in Twentynine Palms, a city of 28,000 residents about 50 miles (80 km) northeast of Palm Springs, as part of the investigation.

“Thank God today happened to be a day that we have no patients,” Dr. Maher Abdallah, who leads the clinic, told The Associated Press in a phone interview Saturday.

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Associated Press writer Christopher Weber contributed from Los Angeles.