US marines presumed dead off Queensland coast

The search has been called off for the three US marines missing off the coast of Queensland after their aircraft had a "mishap".

The MV-22 Osprey entered the water at around 4pm on Saturday (local time). Twenty-six crew members were on board and 23 were rescued within an hour.

A search for the missing trio was carried out overnight but has since been called off.

"Operations have now shifted to recovery efforts," a statement from the III Marine Expeditionary Force (III MEF) said.

"The circumstances of the mishap are currently under investigation, and there is no additional information available at this time."

The recovery and salvage is expected to take several months and is to be carried out with the Australia Defence Force's assistance.

The Osprey aircraft was in Queensland as part of a joint training exercise between the Australian and US military forces.

No Australians were on board at the time of the crash.