OREGON CITY, ORE. ? The FBI uncovered human remains Saturday in an outbuilding behind the house of Ward Weaver, the self-described No. 1 suspect in the case of two missing girls who lived across the street from him, officials said.

The remains of one person were found hidden in a shed, said Charlie Mathews, special agent in charge of the FBI’s Portland office. Teams continued to look under a concrete slab directly behind the house for more remains, he said.

Police Chief Gordon Huiras said the body had been turned over to the medical examiner and had not been identified.

Around 3 p.m., the girls’ grandfathers Don Martin and Wesley Duffey abruptly left the scene, saying they had to be with their daughters.

Weaver, a 39-year-old single father who knew both Ashley Pond and Miranda Gaddis, was evicted from the single-story house after his arrest Aug. 13 on charges he raped his son’s 19-year-old girlfriend.

He was in jail on $1 million bail; he has not been charged in the twin vanishings, Mathews said.

The night of the alleged rape, his angry and distraught son told 911 dispatchers that his father had confessed to killing Ashley and Miranda.