Emergency services are on scene at a two vehicle crash, in which a young woman and infant child, have died.

Shortly before 5pm, police received a report of a serious crash involving a truck and a car on Roper Highway, near the vicinity of Strangeways River.

The woman and child died at the scene. Two other occupants of the vehicle are being treated at the scene.

Motorists are advised that traffic diversions are in place. A crime scene has been declared.

Detectives from the Major Crash Investigations Unit are investigating.