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The Napa County Sheriff's Office is investigating the remains of two human skeletons that were found this week beside a rural Napa County road on a hillside that had been burned clean of ground cover in a recent wildfire.

Concrete workers reported seeing what appeared to be a human skull within view of Butts Canyon Road on Monday, said Sheriff's Capt. Keith Behlmer.

Although it looked like a skull, the workers did not stop to check it out until they noticed it again on Wednesday when they reported it, Behlmer said.

Sheriff's investigators determined on Wednesday morning that the skull was human, Behlmer said.

The area was guarded throughout Wednesday night so the investigation could continue all day Thursday, he said.

Additional bones were located throughout the area, which was devastated by fire within the last year or two that removed ground cover, Behlmer said.

The remains appeared to have been washed down from the top of a nearby hill, he said. There were enough bones to assemble two human skeletons, but only one skull has been found, he said.