At least ten civilians were killed in an airstrike conducted as part of a joint Afghan/Isaf military operation in eastern Kunar province on Tuesday night, local officials said.
Isaf has not confirmed the incident but acknowledged the reports.
"We are still at the point of gathering information on the alleged incident," an Isaf spokesman told TOLOnews Wednesday afternoon.
"We take these allegations very seriously."
According to Kunar officials, the airstrike took place in Shigal district of the province last night, killing five children, four women, and two men, provincial governor Sayed Fazlullah Wahidi told TOLOnews.
"We were not informed about the airstrike [beforehand] which was launched last night in the district," he said.
At least two Taliban insurgents were also killed in the airstrike and four others including three girls were injured, officials said.
Isaf's Wednesday operations update said an airstrike happened in Kunar on Tuesday, but it was a different district.
"Afghan and coalition forces killed two insurgents during an operation in Ghaziabad district, Kunar province, Tuesday," Isaf said.
"During the operation, the security force observed two individuals engaged in insurgent activity. The security force engaged the insurgents with a precision strike, killing both.
"A post-operation assessment determined no civilians were harmed and no civilian property was damaged during the operation," Isaf added.
Meanwhile, Taliban spokesman Zabihullah Mujahid has claimed that after the Shigal district airstrike, a clash happened between the Taliban, Nato and Afghan troops and several Afghan security forces were killed or injured.
He said no Taliban insurgents were killed or injured in the clashes.