An Australian military Black Hawk helicopter crashed on Thursday near an air force base in eastern Australia, injuring at least five people.
The Black Hawk is a multi-purpose helicopter
Queensland state police said the accident happened near Mount Walker, near Brisbane at about 1100 (0000 GMT).
A mayday call was received before the crash, police said.
Eighteen Australian soldiers were killed in 1996 when two Black Hawks collided during a night training exercise in Queensland.
The helicopter was about 20km (12 miles) south-west of Amberley air force base when it crashed. It had taken off from an army base in nearby Toowoomba for a routine training flight, said Defence Force spokesman Dan Wheelahan.
The spokesman did not know how many people were on board.
Emergency services described the crash site as a "mess".
"We were all wondering how anyone got out of it alive," Brian Nash of Queensland Ambulance Service said.
The Black Hawk is a combat helicopter, designed to move quickly into hostile environments and deliver or collect troops and armaments.
The basic model of the helicopter can also be adapted for medical evacuation or a purely offensive combat role. They can carry up to 12 people plus four crewmembers.