Authorities called the attack terrorism and said Bartkus left behind nihilistic writings that indicated views against procreation, an idea known as anti-natalism.

One person was killed and at least four other people were injured in a vehicle explosion outside of a fertility clinic in Palm Springs in what the FBI called an "intentional act of terrorism."

The FBI said in a Saturday briefing that it was a deliberate attack. "This was an intentional act of terrorism. As our investigation will unfold we will determine if it's international terrorism or d...