The father of Guy Edward Bartkus is speaking out after news that his son is the person investigators believe to be the suspect in the bombing at a Palm Springs fertility clinic on Saturday. Richard Bartkus says that he hasn't spoken to his 25-year-old son in more than a decade and that he is not the person he remembers.

The FBI believes the 25-year-old suspect in the Palm Springs explosion left behind "anti-pro-life" writings before carrying out the attack, officials said.

Here's the latest on the suspect in "one of the largest bombing investigations we've had in Southern California," according to the FBI.

Anti-natalist ideology appears to be the motive behind Saturday’s deadly bombing in Palm Springs, two senior law enforcement officials told NBC News.

Investigators are still learning about the suspected Palm Springs bomber. Multiple officials tell NBC4 the bombing was driven by anti-natalist ideology.

At a press conference, Akil Davis, FBI assistant director in charge of the Los Angeles field office, said the bombing was “an intentional act of terrorism.”