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U.S. federal agents arrested Daniel Park for allegedly helping a suicide bomber attack a fertility clinic in California.
Authorities say Park shipped chemicals and conducted bomb tests with the bomber months before the explosion.
He allegedly collaborated with Guy Edward Bartkus, who died in the 17 May blast in Palm Springs.
The FBI tracked Park down and arrested him Tuesday night at JFK Airport in New York.

Park Shipped Chemicals and Tested Explosives with Bartkus

The FBI claims Park began buying ammonium nitrate in October 2022.
He bought more days before the explosion and shipped it to Bartkus.
In January, Park sent 180 pounds of the chemical and later 90 more.
Park visited Bartkus in Twentynine Palms and stayed for two weeks.
They tested explosive materials in a detached garage and a private room.
Agents found bomb-making instructions in Park’s home near Seattle.
Officials linked the recipe to the Oklahoma City bombing.

Anti-Natalist Beliefs Tied to Attack

Park and Bartkus met through anti-natalist online communities.
They shared the belief that humans should stop reproducing.
The FBI said Bartkus targeted the clinic to oppose assisted reproduction.
The blast damaged the clinic and nearby buildings.
Investigators have not confirmed if Bartkus intended to kill himself.
He allegedly tried to livestream the attack but failed.

Court Documents Reveal Radical Online History

Park regularly posted on anti-natalist Reddit forums for nearly a decade.
In 2016, he wrote about recruiting others to join the movement.
He called anti-natalism a hopeful ideology in older posts.
In March, Park asked for fellow activists to protest with him in Washington state.
His post received no replies, according to federal prosecutors.

International Escape and Extradition from Poland

Park fled to Poland four days after the bombing.
Authorities located him overseas and arranged for extradition.
He returned to the U.S. in federal custody.
On Wednesday, Park appeared before a judge in Brooklyn federal court.
The investigation remains active as officials review possible wider connections.