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US grounds fleet of F-22 fighter jets, indefinitely (AFP)

A US Air Force's fighter F-22 Raptor lands at Kadena US Air Base in Kadena town in Japan. The radar-evading F-22 Raptors have been barred from flying since May 3 and Air Force officials could not say when the planes would return to the air.(AFP/File)AFP - The US Air Force has grounded its entire fleet of F-22 fighters, the most sophisticated combat aircraft in the world, after problems emerged with the plane's oxygen supply, officials said Friday.