KUNDUZ, Afghanistan — Fourteen members of a family, including three small children, were killed in northern Afghanistan when an American airstrike destroyed their home, several Afghan officials confirmed on Friday.

In what has become a familiar litany, particularly in Taliban-dominated Kunduz Province, Afghan and American officials had initially denied that any civilians had been killed in the strike on Thursday, claiming the victims were Taliban fighters.

Then 11 bodies belonging to women and children appeared at the hospital in Kunduz City, about four miles from the site of the attack in Chardara District. The Taliban do not have women fighters and the children were very young.

Soon after the attack, district officials described the incident as an airstrike that went wrong, in which only civilians were killed. “There were 12 killed and one wounded by American jets in Chardara District, and all casualties are civilians,” said Abdul Karim, the local police chief. Two other children were later counted as dead because they were known to have been in the house, although their remains could not be found in the rubble, residents and relatives said.