The FBI is interviewing the parents of Payton Gendron, the white supremacist teen who massacred 10 people at a Buffalo supermarket Saturday, law-enforcement sources told The Post.

Paul and Pamela Gendron — both civil engineers with the state Department of Transportation — are cooperating with investigators, sources added to AP.

The couple’s 18-year-old son allegedly traveled about 200 miles from the family’s home in Conklin, NY, to the Buffalo Tops Friendly Market, where he launched the slaughter. Payton specifically researched neighborhood’s demographics to target a predominantly black community, sources have said.

Terry Place, who lives a few doors down from the Gendrons in Conklin, said his family had occasional typical neighborly interactions with the shooter’s parents — and only really remembered Payton as their old paperboy.

“We spoke to her a couple times here and there,” Terry Place said of Pamela Gendron, who was known to take morning walks along their quiet street in recent years.

A preliminary investigation found that Payton Gendron had repeatedly visited sites espousing white supremacist ideologies and race-based conspiracy theories and extensively researched the 2019 mosque shootings in Christchurch, New Zealand, and the man who killed dozens of people at a summer camp in Norway in 2011, authorities have said.

Additional reporting by Zach Williams and Post wires