Gunmen attacked a military air base in the eastern Afghan province of Khost, officials said on Saturday.
Khost police spokesman Faizullah Ghairat said that three militants had attacked the base. One had been killed, while two others were still holding out, he said.
There was no immediate comment from the headquarters of the NATO-led Resolute Support mission in Kabul.
The incident comes just ahead of the normal start of the spring fighting season, when warmer weather brings increased operations by both insurgents and government forces.
Afghan and US officials have warned that Afghanistan will see increased fighting this year as the Taliban step up an insurgency which has cut the area controlled by the government to below 60pc.—AP