Daniel Park, the 32-year-old Washington man accused of helping orchestrate a car bombing outside a fertility clinic in Palm Springs, died Tuesday while in federal custody, according to a statement from the Justice Department. Park was found unresponsive at the Metropolitan Detention Center in Los Angeles, where he had been held since June 13 following his indictment. Authorities say emergency responders attempted life-saving measures before transporting him to a hospital, where he was pronounced dead. The cause of death has not been disclosed, though officials noted that no other inmates or staff were harmed and the public was never at risk.

Park had been charged with malicious destruction of property and providing material support to a terrorist. He was arrested in Poland and extradited to the U.S. after federal prosecutors linked him to the May 17 bombing outside the American Reproductive Centers clinic. The blast left four people injured and killed 25-year-old Guy Edward Bartkus, identified as the primary suspect and believed to be the attacker. Prosecutors alleged that Park provided Bartkus with 270 pounds of ammonium nitrate, a chemical commonly used in explosives.

Daniel Park.

The FBI has described the bombing as an “intentional act of terrorism,” citing that both Bartkus and Park adhered to anti-natalist, pro-mortalist, and anti-abortion ideologies. Investigators revealed that Park had spent two weeks with Bartkus in Twentynine Palms earlier this year, reportedly conducting bomb-making experiments in a garage. Authorities also recovered a bomb-making formula from Park’s Seattle residence that resembled the one used in the Oklahoma City bombing.

“We believe that Park had knowledge of how to create an ammonium nitrate-fueled bomb,” said Akil Davis, assistant director of the FBI’s Los Angeles office. He added that Park’s social media activity suggested an attempt to recruit others who shared his radical beliefs.

The explosion severely damaged the clinic and scattered debris across a 250-yard radius. Despite the force of the blast, the clinic’s lab, which stores sensitive reproductive materials, was not harmed, and no staff members were physically injured.