A bomb explosion outside a California fertility clinic has killed one person and injured four others in an "intentional act of terrorism", FBI officials have said.

The blast happened just before 11:00 local time (19:00 BST) less than a mile from downtown Palm Springs, near several businesses including the American Reproductive Centers (ARC). The clinic said no-one from the facility was harmed.

The FBI later said it had "a person of interest" in its investigation, but officers were "not actively searching" for the suspect.