The FBI said Saturday the bombing of a California fertility clinic was a terror attack, and that the facility was likely targeted deliberately.

"This was an intentional act of terrorism. As our investigation will unfold we will determine if it's international terrorism or domestic terrorism," Akil Davis, the head of the FBI's Los Angeles field office, told reporters.

In response to a question on whether the clinic in Palm Springs was purposefully targeted, Akil said: "We believe so, yes." (AFP)