Investigators have not yet determined how long human remains found in Coweta County had been buried. But they could have been there for decades, the county sheriff said.

Two boys digging a hole for a campfire found a skull and bones Friday night on Welcome-to-Arnco Road and called police, The Newnan Times-Herald reported.

“We have confirmed that they were human remains, buried in a shallow grave, probably 25 or 30 yards beyond a heavily-wooded wood line behind the house," Sheriff Mike Yeager told the newspaper. "Those were pretty thick woods where the kids were back there playing.”

Crews excavated the area for about five hours in search of any other bones, Yeager said.

The remains will be examined by the GBI.