It's been reported that a small plane came apart in the air, dropping parts throughout a neighbourhood in southern California.
It is still unclear whether or not the pilot is one of the deceased.
Images from the scene showed flames engulfing the two homes and residents rushing to the scene.
Twitter user Joshua Nelson wrote, "A few houses down [from the crash] the propeller and engine landed in their yard".
The aircraft has been identified as a Cessna 414A and had departed the Fullerton Municipal Airport when it went down before 2 p.m. local time.
The Orange County Fire Authority said the crash in a Yorba Linda neighborhood ignited the house Sunday afternoon.
A small plane crashed in a residential California neighborhood on Sunday and set a single family home ablaze, officials said.
Clint Langford, who lives about half a mile away, said he was in his living room when he heard a low rumbling. "It was scary", he said. "It shook our house".
He looked out his front door and could see plane parts falling out the sky in the distance.
The Orange County Sheriff said the plane crashed under unknown circumstances.
Rain from a winter storm helped firefighters extinguish the house fire. They planned to search the burned house in case there were additional victims, Sanchez said.
The US National Transportation and Safety Board will investigate the cause of the crash.