The FBI believes the suspect in the Palm Springs explosion left behind "anti-pro-life" writings before carrying out the attack, officials said.

Police Chief Andy Mills told News Channel 3's Peter Daut that other people could potentially face charges if investigators learn they had some prior knowledge about the Palm Springs bomb explosion or the suspect's activities.

Guy Edward Bartkus, 25, is the primary suspect in the bombing at American Reproductive Centers in Southern California. The bombing left four people injured, and Bartkus died in the explosion that has been called an “intentional act of terrorism,” according to the FBI.

Authorities identified the suspect in the explosion at a Palm Springs, California, fertility clinic as Guy Edward Bartkus, 25, of Twentynine Palms, saying at a news conference Sunday that he is the man suspected to have died in the bombing that injured four other people.

A loud explosion-like sound was heard in California's Palm Springs on Saturday. Locals posted photos and videos of what appeared to be a human carcass. Footage showed windows shattered on several buildings. Authorities are yet to confirm the cause of the alleged explosion.