An Afghan official says a battle in western Afghanistan has killed dozens of Taliban militants after three US troops were killed in a complex ambush. Afghan army spokesman Maj. Abdul Basir Ghori says Sunday that coalition forces launched airstrikes in the western province of Farah. Ghori says the strike Saturday was in response to an attack on a convoy that killed three Americans and seven Afghan soldiers. US military spokeswoman Capt. Elizabeth Mathias confirmed fighting continued after the ambush. Ghori says about 50 insurgents were killed. No other officials could immediately confirm that toll. Afghan police spokesman Raouf Ahmadi says a coalition airstrike went astray and hit a home killing a woman and a teenage girl.