“Today morning an explosion took place outside Kabul military airport, due to which a number of our citizens were martyred and injured,” spokesman Abdul Nafi Takor told Reuters news agency, adding that an investigation is under way.
He did not specify the nature or target of the explosion. There was no immediate claim of responsibility for the blast.
Local residents said a loud explosion was heard before 8am (03:30 GMT) in the vicinity of the military side of the heavily fortified airport.
They said the area had been sealed off by security forces, and all roads had been closed.
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