The FBI says the suspect responsible for detonating a car bomb outside a California fertility clinic appears to have been motivated by anti-natalist ideology.

A suspect believed to be the perpetrator of the fertility clinic bombing in Palm Springs, Calif. Saturday, has been identified as 25-year-old Guy Edward Bartkus, a resident of Twentynine Palms, home to a large U.

Authorities called the attack terrorism and said Bartkus left behind nihilistic writings that indicated views against procreation, an idea known as anti-natalism. Here’s what to know about the case.