Story highlights Two children survived in what police describe as a "miracle"

Four people died after they were caught in machinery of rapids ride

(CNN) Two children survived a deadly ride malfunction at Australia's largest theme park, which killed four people on Tuesday.

Police said Wednesday a boy and a girl, aged 10 and 12, were able to "extricate themselves", in what Brian Codd, Assistant Commissioner for Southeast Region of Queensland Police Service, described as "almost a miracle."

Previously, police had said the survivors were two girls.

Six people were riding on a "flume" at the Thunder River Rapids Ride at Dreamworld theme park in Queensland when the malfunction occurred.

Their flume flipped after it came in contact with another carriage towards the end of the ride, tossing some of the passengers onto the conveyor belt, where they were caught in the machinery, Codd said on Wednesday morning.

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