Airstrike killed 3 civilians in Afghanistan, governor's spokesman says

An Afghan provincial government spokesman has alleged that a NATO airstrike killed at least three civilians and injured another in Afghanistan's Khost province Tuesday.
A spokesman for NATO's International Security Assistance Force, Lt. Col. Will Griffin, said ISAF is looking into the allegation.
Helicopters fired at houses in Khost's Nadershahkot district early Tuesday, killing a woman and two children and injuring a man, said Mubarez Zadran, spokesman for Khost's governor.
Afghan officials are investigating the incident, Zadran said.