As of Sunday at 5 p.m., the FBI is calling the car bombing in downtown Palm Springs the largest explosion in Southern California’s history. New details continue to emerge about the suspect, 25-year-old Guy Edward Bartkus from 29 Palms, who investigators believe died in the blast and is now the prime suspect in what federal officials are classifying as an act of domestic terrorism.According to the FBI’s Los Angeles field office, Bartkus was found deceased near a 2010 silver Ford Fusion sedan with California license plate 8HWS848, which authorities believe was used to detonate the explosive device. FBI Assistant Director Akil Davis said in a press conference Sunday morning that Bartkus is believed to have had “nihilistic ideation” and targeted the IVF clinic deliberately. Officials say Bartkus left behind a manifesto and may have attempted to livestream the attack.All staff at American Reproductive Centers, the target of the blast, were safe, as the clinic was closed Saturday. In a…..