The explosion on Saturday morning, which occurred in or near a vehicle less than a mile from downtown Palm Springs, Calif., was “an intentional act of terrorism,” the F.B.I. said.

Residents near the Palm Springs blast site were allowed to return home on Monday, but the clinic remained closed.

The suspect, who died in the explosion that tore through the clinic and rattled the upscale California city of Palm Springs, also attempted to record or stream the attack