Neighbor: 'We really don't know who exactly lived there'

This is a developing story. Watch KVAL News and for updates

EUGENE, Ore. - Sheriff's deputies spent the night sifting through the ashes of a house fire where one person was found dead Tuesday.

The cause of the person's death and the cause of the fire remain under investigation.

"We pretty much treat everything as a crime scene when we get there until we can determine that it's not," said LCSO sergeant Carrie Carver. "We have folks looking over it and keeping security over it to make sure evidence isn't destroyed."

The identity of the deceased has not yet been released.

Crime scene tape cordons off the house on River Road, where a fire broke out around 2 p.m. Tuesday.

Passersby saw flames shooting out of the upstairs window of the home.

Neighbor Jackie Harmon said the people who lived in the home kept to themselves.

"I know of a man and woman that were always around, and at least three kids," Harmon told KVAL News. "But there were always others in and out. We really don't know who exactly lived there."

Harmon said she often heard loud fighting coming from the home.

"The couple that lived upstairs tended to fight kind of loud," she said.

Investigators from the Lane County Sheriff's Office were back on the scene combing through evidence Wednesday afternoon.

"It's difficult to say what actually happened in this house fire and what the cause of death is," said Carver. "A fire in any sort of situation makes a scene very difficult to work. That's probably going to prolong the length of this case unfortunately."

Carver said the medical examiner would release the cause of death within the next few days. Until then, the sheriff's office is not releasing the name, age or gender of the victim.