A man who woke up his family amidst a house fire that broke out early Christmas morning was able to get them to safety, but died in the blaze himself.

The fire broke out around 6 a.m. in the Oak Knoll neighborhood, and around 20 firefighters responded, said Oakland Fire spokesperson Michael Hunt. The man was able to get his brother, father and aunt to safety outside, but then apparently went back inside the house, either to look for belongings or because he got disoriented, Hunt said. He didn’t come back out.

Firefighters searching the house found the man unconscious inside. He was likely overcome by the smoke and died around 6:30 a.m., Hunt said.

No one else was found inside the home.

The cause of the fire appears to be accidental, officials said. It’s unknown if smoke detectors were functioning or present.