Two people, a man and a woman, were confirmed dead in a taxi accident on the M4 northbound near Virginia on Sunday morning, said paramedics.
Garrith Jamieson of Rescue Care said the taxi had caught alight after crashing on the busy freeway.
He said multiple patients were being treated at the scene.
The two dead suffered serious burns and 15 others had been transported to hospitals for treatment.
“The single taxi somehow lost control and overturned,” said Jamieson.