Nato forces in eastern Afghanistan say their helicopters have been fired upon by a Pakistani military checkpoint.
The Western alliance said its aircraft had not crossed into Pakistani airspace when they came under fire in Khost province, news agency AP reports.
The incident comes amid growing tension over a number of recent incidents at the Pakistan-Afghan border.
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In a statement on the latest incident, Nato's International Security Assistance Force (Isaf) said there had been no damage or casualties.
"Isaf helicopters received small-arms fire from a Pakistan military checkpoint along the border near Tanai district, Khost, September 25 while conducting routine operations in Afghanistan," it said in a statement.
"At no time did Isaf helicopters cross into Pakistani airspace," it added.
Isaf said it was working with the Pakistani military to resolve the incident.
(BBC)
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