KABUL, June 21 (Xinhua) -- Two soldiers of the NATO-led International Security Assistance Force (ISAF) were killed as they came under indirect fire targeting the U.S. forces main base in Afghanistan, a press release of the alliance issued Sunday said.

    "Two International Security Assistance Force (ISAF) service members were killed and six other personnel were wounded in an indirect fire attack on Bagram Air Field this morning," the press release added.

    "On behalf of ISAF, I share our grief and extend our support to the loved ones of these service members," said Brigadier-General Richard Blanchette, ISAF Spokesperson, the press release further said.

    The wounded service members were transported to a medical facility on Bagram Air Field for immediate medical treatment, where they are receiving expert medical care, the press release added.

    Bagram, 50 km north of Afghan capital Kabul, has been serving as the headquarters of U.S.-led forces in the post-Taliban central Asian state since overthrowing Taliban regime in late 2001.

    Conflicts and violence have claimed 146 international troops so far this year in the post-Taliban country.