Fighter jets from the RAF's Typhoon fleet have been grounded following safety concerns, the MoD has confirmed.
Non operational flights from the fleet were ordered not to fly after a crewman, believed to be from the Spanish airforce, died during a training flight.
Safety concerns are believed to surround the harness system on the jet's ejector seat.
There are more than 60 planes in the RAF's Typhoon fleet.
An MoD spokesman said: "The safety of our personnel is paramount.
"Investigations following an accident involving a Spanish Typhoon have highlighted a potential issue with the aircrew harness system.
"As a precaution, non-operational Typhoon flights have temporarily been suspended pending modification.
"Typhoon Quick Reaction Alert in the UK and Falkland Islands is not affected as those aircraft have already been modified."
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