Two Americans were killed and another three were injured in a rare attack on foreign troops in the Afghan capital Wednesday, U.S. and Afghan officials said. A gunman fired on international advisers at an ammunition depot near Camp Morehead, a training site for Afghan commandos, about six miles south of Kabul. The attack, which took place near the entrance of the base, killed one U.S. service member and injured another. One U.S. civilian was also killed, and two more were wounded in the assault, a statement from the NATO-led coalition said. The gunman, who according to the Afghan Defense Ministry was wearing an Afghan army uniform, was killed after international troops responded with gunfire. The injured Americans remained in stable condition.