http://english.aljazeera.net/NR/exeres/0C9913A0-F8E5-41E0-B40C-661E3450B73A.htm US troops have killed 16 Afghan civilians after they opened fire following a car bomb attack on their convoy, US military officials have admitted. At least 24 civilians were also wounded in the incident in the eastern province of Nangarhar. A suicide bomber in a minivan packed with explosives rammed the convoy and armed men opened fire from different points in a "complex" attack, US officials said. But Afghans at the scene say US troops opened fire on them indiscriminately. There were no reports of casualties among US soldiers. Thousands of Afghans protested at the scene of the killings, blocking the main road between the Afghan capital, Kabul, and the Pakistan border and throwing rocks at police.