The suspect behind the explosion at a Palm Springs, California, fertility clinic, Guy Edward Bartkus, died as a result of the attack. Law enforcement officials said Bartkus made a series of posts on social media,

“Make no mistake: This is an intentional act of terrorism,” Akil Davis, the head of the FBI’s Los Angeles field office, told an evening news conference.

Law enforcement sources told CBS that the Bartkus, the suspect, is a resident of Twentynine Palms, home to a large marine base about an hour away from Palm Springs.