An RAF aircraft is missing, following reports that it was hit by an American missile.
A Ministry of Defence spokesman at Central Command in Qatar said it had been returning from a mission over Iraq.
It was not yet known what type of aircraft was involved or how many crew were on board, although a search for survivors is underway.
It is thought the plane was brought down by a US Patriot anti-missile system stationed in the Gulf to protect Kuwait and coalition forces stationed there.
The MoD spokesman said there were "no further details at this stage."
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