Two helicopters have collided near a marine theme park in the Australian state of Queensland.

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.

The Australian Transport Safety Bureau has confirmed that the mid-air collision was fatal.

Queensland Ambulance Service said 13 patients are being assessed at the scene, while local media reported that four people had been killed in the incident.

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.