Separately, Afghan forces say they have killed 50 Taliban fighters in the heaviest fighting in a western province of Afghanistan.
Mohammad Gul Sarjang, the provincial police spokesman, said on Thursday that the clashes in the troubled Farah province was continuing for a third day.
The Taliban dispute the casualty figures and maintain they are in control of the district.
Taliban fighters also attacked another district of Farah on Wednesday night, sparking a six-hour fight with security forces, Sarjang said.
US-led coalition forces meanwhile have killed two children and a 75-year-old man in a raid on a house in eastern Afghanistan.
The deaths occurred in Batti Kot district of Nangarhar province late on Wednesday, the Afghan police said on Thursday.
"They have killed a 75-year old man, a 16-year-old girl and a young boy in the firefight", said a local police chief.
Two other civilians were treated for injuries and three people were arrested by coalition forces.
A coalition statement said its forces killed a fighter after suspecting the house to be a hideout for facilitators of suicide bombings and improvised explosive attacks.
"It wasn't until after the hostilities had stopped and the team had performed a search of the room that they found two children dead. A wounded adult female and child were also found", it said