A spokesman for the Coeur d'Alene Tribe said the identity of the human remains found in the rubble of the burned old Sister's Building might never be revealed.

"It could just be a mystery that never will be solved," said Marc Stewart, Tribe spokesman. "This person might never be (identified). Limited remains were found."

The remains, just bone, were buried under rubble that burned for three days, he said. The sex of the body hasn't even been determined, he said.

The Spokane County Medical Examiner's Office is trying to identify the remains currently, he said.

The medical examiner could recommend the bones be sent to a DNA lab in Texas for more advanced study, he said.

If there is an ID, it could take weeks.

The family of a North Idaho man named Daniel J. Uhnak, who's in his early 20s, believe he might be the fire victim. Stewart said there's been no evidence found so far that points to Uhnak as the victim.

All that's left of the building after the intense fire is brick, ash, and steel pipe, he said.

The intensity of the Feb. 3 blaze also might mean the cause of the fire will remain a mystery too, he said. It appears now that the fire started in the basement.

The FBI is helping investigate the fire because it could have been arson.

The three-story brick building was constructed in 1908 and used as a boarding school until 1974. The original school, which was built in 1882, burned to the ground in 1905.

The building was listed on the National Register of Historic Places. Up until its destruction, the Tribe used the building for educational and cultural purposes, storage, and to house telecommunication equipment for wireless Internet services for the DeSmet area.