The FBI believes the suspect in the Palm Springs explosion left behind "anti-pro-life" writings before carrying out the attack, officials said.

Bartkus has been named as a suspect in the bombing outside a Palm Springs fertility clinic, two law enforcement sources familiar with the investigation told KCAL News. He also allegedly stated in writings and recordings that he was a “pro-mortalist” — or against bringing people into the world against their will, the sources added.

A loud explosion-like sound was heard in California's Palm Springs on Saturday. Locals posted photos and videos of what appeared to be a human carcass. Footage showed windows shattered on several buildings.