KABUL, Afghanistan  In the wake of charges from Afghan officials that civilians were killed in two attacks over the weekend, the American military apologized for one episode in which a child was killed and two other children wounded and said it was investigating the deaths of several civilians in the other episode.

On Sunday in Logar Province, insurgents fired on a police checkpoint and a nearby American base. The Americans returned fire and later discovered that they had killed two civilians, according to a NATO spokesman and local Afghan officials. Din Mohammed Darwish, the spokesman for the Logar provincial governor, said one of the dead was an 8-year-old girl. Two boys, ages 6 and 9, were wounded, he said. The American military issued a statement apologizing for the deaths.

On Saturday, the American military killed the Taliban shadow governor and several other Taliban commanders in an air assault on a meeting of Taliban leaders in the Nad Ali district of Helmand Province, according to a NATO spokesman and the local police. However, three civilians were among the dead, and three boys, ages 11, 12 and 16, were wounded, said Mohammed Hakim Angar, the provincial police chief. The episode is under investigation.