A US air strike aimed at an IS checkpoint is likely to have killed four civilians, possibly including a child, the US military has said.
On Friday the military released the findings of an investigation into the incident, which took place in March.
Investigators concluded the checkpoint was a valid target and the attack did not violate international laws.
The US has rarely acknowledged civilian deaths in the fight against IS and the announcement brings the total to six.
"All reasonable measures were taken to avoid unintended deaths of, or injuries to, non-combatants," US Central Command spokesman Patrick Ryder said.
Col Ryder told reporters that the four civilians emerged from vehicles parked near the checkpoint, near the northern town of al-Hatra, after the A-10 jet released its weapons.
He said the plane's crew was not aware of their presence at the time the strikes were authorised.
