Police are investigating whether officers at a traffic enforcement site tried to intercept a car that crashed and killed two young children in southeast Queensland.
A four-year-old girl and six-year-old boy died instantly when a car slammed into a tree and split in two at Peaks Crossing south of Ipswich at about 2.45pm on Monday.
An eight-year-old girl who was in the front passenger seat is in a stable condition in hospital.
The female driver in her 30s, who was airlifted to hospital, is in a critical but stable condition.
Vision from the scene shows a devastated man, crying on his hands and knees at the edge of the road as a police officer tries to console him.
The forensic crash unit is investigating but police say that wet weather was likely a factor.
Officers are appealing for anyone who witnessed the crash, or has dashcam vision to come forward.
A police spokesman confirmed the Ethical Standards Command is investigating the involvement of officers at a nearby static traffic enforcement site.
He would not confirm media reports police had tried to intercept the car before it crashed.
Chaos on major highway after mass pile-up
Paramedics also reported about 20 vehicles, including a bus, were involved in a crash near Jindalee Bridge at 2.15pm on Monday.
In total, 27 people were involved in the incident, with five physical injured and taken to hospital.
Drivers further back were hit with major delays as the motorway was closed while the vehicles and debris were cleared.
They are assessing four patients in that crash, which coincided with the afternoon storms.
The weather bureau is still warning of severe thunderstorms for southeast Queensland.
Do you know more or have a story tip? Email: firstname.lastname@example.org.