Davis added that the FBI was conducting a court-approved search at the suspect’s home. “We do not believe that there’s an ongoing threat to the public,” he added.
Davis said the FBI is tracking “a possible manifesto” as part of its investigation.
US media outlets reported that a website contained messages that appeared to be linked to the suspect, in which he laid out a loose argument against human life.
“Basically, I’m a pro-mortalist,” the author wrote, according to a description of the site in the Los Angeles Times.
Video posted online after the attack showed the single-story structure that houses some of the clinic’s operations. The bomb appeared to have ripped a gaping hole in one of its walls and caused damage throughout the building.
Officials said they are receiving hundreds of tips and collecting evidence, including pieces of the vehicle that exploded and were strewn several hundred feet in every direction. Davis said it is considered the largest bombing crime scene in southern California history.
Bartkus was not known to the FBI prior to the incident.
