An Afghan official says 11 civilians, including 10 children, have been killed in an airstrike during a weekend military operation in eastern Afghanistan.

Wasifullah Wasify, a government official in Kunar province, said Sunday the airstrike occurred the day before during a fierce gunbattle between Taliban militants and a joint force of U.S. and Afghan forces.

He says 10 children and one woman were killed when the airstrike destroyed a house in a remote area of the province.

A U.S. civilian adviser also was killed in Saturday's fighting.

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