HOW THE DREAMWORLD TRAGEDY UNFOLDED
* The Thunder River Rapids ride malfunctions around 2.20pm on Tuesday
* One vacant carriage becomes stuck at the bottom of a conveyor belt
* The carriage following behind carries six passengers; Roozi Araghi and his partner Luke Dorsett; Kate Goodchild and Cindy Low and a 12-year-old girl and a 10-year-old boy
* The second carriage hits the trapped carriage and flips
* The four adult passengers are trapped, two on the conveyor belt and two in the water below.
* The two children survive in what police have hailed as "almost a miracle"
* Emergency workers rush to the scene but the four adults are declared dead
* Dreamworld has been closed until further notice while police investigate the tragedy
* Gold Coast Acting Commissioner Brian Codd has vowed the police investigation will leave no stone unturned.
