Other reports say the crash involves a V-22 Osprey with approximately 20 US Marines aboard. No fatalities have currently been reported, and at least some people have been rescued, but I haven’t seen any clear reports as to whether there are any casualties, or if everybody is safe and well.
Further reports (behind paywalls) say a number of US personnel are missing. Four people, including one critically injured are currently either en route to hospital or have arrived at hospital in Darwin.