NATO's International Security Assistance Force (ISAF) confirmed an air strike in Helmand province's Nawa district on Sunday, saying that three insurgents died and it was investigating reports that children were also killed.
"Two Taliban mine-planters were identified and targeted by ISAF from the air and killed," district police chief Ahmad Shah Khan told AFP.
"Three children, two boys and a girl, who were nearby collecting firewood were also killed," Khan added.
Farid Ahmad Farhang, a spokesman for Helmand police, confirmed the incident and said the raid killed two insurgents and three children.
Civilian casualties caused in NATO operations against insurgents are a sensitive issue in relations between the US-led force and the government of President Hamid Karzai.