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Australian amusement park accident kills 4

Four people were killed in an accident at a theme park on Australia's east coast on Tuesday, officials said.

Fatalities occurred on Thunder River Rapids ride at park, which has operated since 1981

Queensland Emergency Services personnel are seen at the Thunder River Rapids ride at Dreamworld on the Gold Coast Tuesday in Australia. Four people died after a malfunction caused two people to be ejected from their raft, while two others were caught inside the ride at the popular theme park. (Dan Peled/AAP via AP)

Four people were killed on Tuesday in an accident at a popular theme park on Australia's east coast, officials said.

Two men and two women died while on a river rapids ride at Dreamworld, a park on Queensland state's Gold Coast, Queensland police officer Todd Reid told reporters.

The Thunder River Rapids ride whisks people in circular rafts along a fast-moving, man-made river. A malfunction caused two people to be ejected from their raft, while two others were caught inside the ride, said Gavin Fuller, an officer with the Queensland Ambulance Service. He did not know if the two victims who were caught in the ride were trapped under water, or caught up in the machinery.

Park staffers administered first aid to the victims, but their injuries proved fatal, Fuller told reporters.

The victims were in their 30s and early 40s, he said.

Reid said he was not aware of any previous problems with the ride.

Media gather at the Dreamworld theme park on Gold Coast on Tuesday after the fatal accident. (Tertius Pickard/AFP/Getty Images)

The park's website said the rafts can hold up to six people and reach a speed up to 45 km/h through the rapids.

Dreamworld CEO Craig Davidson said the park was working with police to try and determine what went wrong.

"We are deeply shocked and saddened by this, and our hearts and our thoughts go out to the families involved and to their loved ones," Davidson told reporters.

A witness, Lia Capes, told the Australian Broadcasting Corp. that she was just about to go on the ride when she saw people running out, crying.

"I was speaking to one of the guys and he said it was the raft or the boat thing in front of him, the whole thing flipped and everyone was screaming," Capes said.

Thunder River is considered one of Dreamworld's tamer, family-friendly rides, and is open to children as young as two. In April, the park's Rocky Hollow Log Ride was temporarily shut down after a man fell from the ride.

Australian Prime Minister Malcolm Turnbull said there would be a thorough investigation into the cause of Tuesday's accident.

"Theme parks are a place for family fun and happiness, not tragedy," he told reporters.

The tragedy Tuesday occurred at Dreamworld, billed as the country's largest theme park, located in Coomera, a suburb of Australia's Gold Coast. (Google)