LOS ANGELES (AP) — Federal authorities arrested a man they say collaborated with the bomber of a fertility clinic in May, alleging that he supplied chemicals used to make explosives and traveled to California to experiment with them in the bomber’s garage months before the attack.

The two men connected in fringe online forums over their shared beliefs against human procreation, authorities told reporters Wednesday. The blast gutted the fertility clinic in Palm Springs and shattered the windows of nearby buildings, with officials calling the attack terrorism and possibly the largest bomb scene ever in Southern California. The clinic was closed, and no embryos were damaged.

Guy Edward Bartkus of California, the bomber, died in the May 17 explosion. Authorities arrested Daniel Park,

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