One person was killed Sunday morning as a fire raged through a two-story home in Mission Viejo, authorities said.

Firefighters dispatched at 2:32 a.m. Sunday to the 24600 block of Athena had the fire out at 5:20 a.m., according to an Orange County Fire Authority public information officer.

The decedent was an adult male, he said.

“Initial crews found a well-involved fire that spread from the first floor to the second, and had rapidly deteriorated,” the department said. “Family members made it out without injuries, but tragically one did not. Because of the extreme conditions inside, firefighters were pulled out of the house and went into a defensive strategy — attack from the outside,” the statement continued.

The cause of the fire was under investigation.

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