Pakistani officials say at least 16 people killed by Afghan forces this week were Pakistani civilians and not Taleban fighters as previously claimed.
Officials said some of the victims' bodies have been returned to the Pakistani border town of Chaman for funerals.
Residents of Chaman said the victims were local villagers on their way to a festival when they were killed.
The governor of Afghanistan's Kandahar province, where the incident took place late Tuesday, said a team of investigators was sent to the area.
Earlier, an Afghan commander had said his soldiers killed at least 16 suspected Taleban militants after they crossed the border from neighboring Pakistan, near Spin Boldak. He said that among the dead were two Taleban commanders believed to have organized several attacks.