Two helicopters have collided near a marine theme park in the Australian state of Queensland, killing four people and leaving three others critically injured.

The collision, just outside Sea World on the Gold Coast, happened around 2pm local time when the park would have been busy with families enjoying the summer school holidays.

Queensland Police said four people were killed and three others were seriously injured.

Queensland Ambulance Service said 13 patients were being assessed at the scene.

ABC News reported that one of the helicopters had a Sea World logo and managed to land after the collision.

ATSB Chief Commissioner Angus Mitchell said investigators would begin arriving at the scene shortly to look into what had happened.

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