Guy Bartkus exhibited warning signs prior to the attack that should have been reported to law enforcement, the city’s police chief told CNN Monday.

The investigation into a deadly explosion — led by the FBI and deemed "an intentional act of terrorism" — at the site of a Palm Springs fertility clinic Saturday is focused on a "person of interest" ...

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