The father of Guy Edward Bartkus, the suspect in the Palm Springs in vitro fertilization facility explosion, says that he was “shocked” when a relative reached out and said his son was implicated in the bombing.

A law enforcement official says the person believed responsible for an explosion at a California fertility clinic posted online ramblings including a belief that the world should not be populated.

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.