A man accused of being involved in the bombing a fertility clinic in Palm Springs last month was found dead in the Los Angeles federal prison on Tuesday.

Law enforcement sources tell TMZ … Daniel Park, who was charged with providing a shocking amount of chemicals used to make the bomb, was “found unresponsive” in Metropolitan Detention Center … and declared dead after staff’s life-saving measures were unsuccessful.

For the moment … just what exactly happened to Daniel is not clear.

Park was accused of providing 270 pounds of ammonium nitrate to the primary suspect — Guy Edward Bartkus, who authorities say carried out the May 17 car bomb attack. Four people were injured in the attack … but Bartkus, of Twentynine Palms, California, was the only person killed in the blast.

Bartkus reportedly held “anti-natalist” views, meaning he thought humans need to stop procreating. He is reported to have left behind “anti-pro-life” writings before he allegedly set off the bomb.

Akil Davis, the assistant director of the FBI’s Los Angeles field office … at the time called the attack an “intentional act of terrorism.”

While the physical clinic was damaged, no embryos were harmed.

Were out to the DOJ and FBI for more info … so far, no word back.