WASHINGTON, May 8 (Xinhua) -- Visiting Afghan President Hamid Karzai said here on Friday that the killing of Afghan civilians by U.S.-led military operation against the Taliban forces is "not acceptable."

    "We believe strongly that airstrikes are not an effective way of fighting terrorism, that airstrikes rather cause civilian casualties and do not do good for the U.S., do not do good for Afghanistan," Karzai told cnn.

    "Airstrikes (against civilians) are not acceptable," Karzai said.

    It was reported that during a military operation, with NATO's air support, against Taliban insurgents on Monday, some 140 people including Taliban and civilians were killed in the international troops' airstrikes in the western Afghan province of Farah.