“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.

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...