Four Americans, including the US ambassadors, Christopher Stevens, were killed in the Benghazi attack. Babara Plett Usher reports from Washington.

包括美国大使克里斯多夫·史蒂文斯在内的四名美国人在班加西袭击中遇难。芭芭拉·皮莱特·亚瑟在华盛顿报道。