On Dec. 18, two people were killed in the morning after two planes collided over Sydney's southwest, authorities confirmed.

One plane landed safely but the other plane slammed into a house and burst into flames, killing two people on board.

There were people inside the Casula house at the time of the crash but they "were safely evacuated and are being assessed by paramedics at the scene," Ambulance Service of NSW spokeswoman Fiona Cook said.

A man who witnessed the accident said the plane destroyed the rear of the home on Box Road, according to a report by the Australian Associated Press.

The second plane, which was also believed to be carrying two people, made its way to Bankstown Airport for an emergency landing. It was unclear what types of planes were involved.

A Bankstown Airport spokeswoman said the airport was closed for a short time after the second plane landed safely.

"All I can say is he was attended to by ambulance officers and interviewed by police and that's a routine procedure after something like this," she said.