Guy Bartkus exhibited warning signs prior to the attack that should have been reported to law enforcement, the city’s police chief told CNN Monday.

A suspect believed to be the perpetrator of the fertility clinic bombing in Palm Springs, Calif. Saturday, has been identified as 25-year-old Guy Edward Bartkus, a resident of Twentynine Palms, home to a large U.

The bombing outside an American Reproductive Centers clinic in Palm Springs, California, shows how difficult the diffuse movement is to combat, say experts.