Deadly chopper collision kills both pilots - ABC News (Australian Broadcasting Corporation)
The men were mustering cattle on Springvale station north of Halls Creek when their helicopters collided this morning.
Both men - aged 37 and 39 - died in the crash.
Police say the alarm was raised about 8:30am when the two helicopters failed to return for refuelling.
A third helicopter found the wreckage about 16 kilometres south-east of the homestead.
Inspector Jim Cave from WA Police says Worksafe and the Australian Transport Safety Bureau are also investigating.
"We're working very closely with them and Worksafe and we'll be assisting them with the investigation and of course we as the police agency will be conducting a coronial investigation for the coroner here in Broome," he said.
Inspector Cave says it is not known what caused the accident.
"I know that there appears to have been a collision between the two aircraft, they are about 30 metres apart from each other and a fire has gone through the scene," he added.