Taleban fighters have been prevented from taking over a small Afghan town centre close to Pakistan's border, Nato and Afghan government officials say.
Nato forces said they were called in to help Afghan national police in Spera in the south-eastern province of Khost.
This was after they were attacked by gunfire and rocket-propelled grenades.
Khost's governor said 50 to 70 fighters had been killed - Nato said the number was in double figures. There is no independent verification.
Both Nato's International Security Assistance Force (Isaf) and the Afghan government said about 100 insurgents had amassed in the district close to the border with Pakistan in the early hours of the morning and appeared to be trying to take over the town centre.
An Isaf statement said helicopter gunships were brought in and the militants surrounded.
It described how some fighters took cover in a nearby building which was then struck by missiles. The fighting from the air and on the ground went on for some hours.