The FBI is investigating footage the San Diego mosque shooters livestreamed during their brutal attack on an Islamic Center, sources told The Post.

The horrifying footage is spreading across social media, showing the terror as it unfolded and the eventual suicide of the mass shooters.

The video, recorded from what appears to be a type of bodycam, shows armed 17-year-old Cain Clark, outfitted in a vest, with 18-year-old accomplice Caleb Vazquez as they storm the Islamic Center of San Diego with their weapons and open fire.

At one point, they can be seen standing over a body and a pool of blood before getting into their BMW.

After driving away from the scene, the alleged video cuts to show what appears to be Clark sitting in the driver’s seat with a pistol. He reaches over and shoots his accomplice in the head, reloads, and shoots him again before putting the gun under his own chin and pulling the trigger.

The horrific shooting at the San Diego mosque killed three people.

The pair were found dead in a BMW a few blocks away from the mosque, the Islamic Center of San Diego. At least one of the suspects left a suicide note that talked about racial pride after taking a weapon from his parents’ home, a law enforcement source told The Post.

Anti-Islamic writings were found in the suspects’ vehicle, and “hate speech” was written on the firearms used in the shooting, according to the source.

A shotgun and a gas can with an “SS” sticker, which appears to represent the Nazi Schutzstaffel, on the side were located at the scene where the gunmen’s bodies were discovered.

Officers responded to the Islamic Center of San Diego for a report of an active shooter around 11:43 a.m. Monday.

Outside the center were three adult men dead from gunshot wounds, according to San Diego Police Chief Scott Wahl, who spoke to the media after the shooting.

“All of our kids are safe. Our hearts go out to the families who, in this moment, are being notified of what has happened to their loved ones,” Wahl said.

Officers were on scene just four minutes after the initial call came in, according to Wahl.

One of the victims was a mosque security guard who “played a pivotal role in assisting [police].”

“This could have been worse,” said Wahl at the press conference.

No children were physically injured, and the FBI is assisting in the investigation.

If you or someone you know is affected by any of the issues raised in this story, call the National Suicide Prevention Lifeline at 800-273-TALK (8255) or text Crisis Text Line at 741741.

If you are struggling with suicidal thoughts, you can dial the 24/7 National Suicide Prevention hotline at 988 or go to SuicidePreventionLifeline.org.

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