Aug 6, 2014 10:27 U.S. official: Americans killed in Afghan attack U.S. official: Americans killed in Afghan attack Associated Press photo by Massoud Hossaini -- Afghanistan National Army soldiers stand guard Tuesday at a gate of Camp Qargha, west of Kabul, Afghanistan. A man dressed in an Afghan army uniform opened fire Tuesday on foreign troops at a military base, causing casualties, an Afghan military spokesman said. In a statement NATO said it was investigating an 'incident' involving both Afghan and international troops at Camp Qargha which trains officers for the country's army. ROBERT BURNS| AP National Security Writer Aug. 06, 2014 Comments WASHINGTON — A U.S. official says “about a dozen” of the victims of an Afghan insider attack on Tuesday were Americans, and at least one American was killed. The official says many details of the attack early Tuesday were still unclear and the numbers could change. The official spoke on condition of anonymity because the official was not authorized to discuss details of the attack by name on the record. A man dressed in an Afghan army uniform opened fire on foreign troops at Camp Qargha, a base west of the capital, Kabul. Among the wounded was a German brigadier general. Gen. Mohammmad Zahir Azimi, a spokesman for Afghanistan’s Defense Ministry, said a “terrorist in an army uniform” opened fire on both local and international troops. Azimi said the shooter had been killed.