`` During the operation , the Afghan and coalition security force observed a large group of heavily armed insurgents engaging in insurgent activity , '' according to the release . NEW : An attacker in an Afghan police uniform killed a NATO service member Sunday , ISAF says . The attack happened at the entrance to Bagram Air Base on the outskirts of Kabul. U.S. Secretary of Defense Leon Panetta called Afghan President Hamid Karzai on Saturday . NATO says an airstrike has killed a senior Taliban leader .
NEW : An attacker in an Afghan police uniform killed a NATO service member Sunday , ISAF says . The attack happened at the entrance to Bagram Air Base on the outskirts of Kabul. U.S. Secretary of Defense Leon Panetta called Afghan President Hamid Karzai on Saturday . NATO says an airstrike has killed a senior Taliban leader .