An independent investigation later identified the culprit as Sarin gas, a highly lethal nerve agent.

一项独立调查后来确定罪魁祸首是沙林毒气，这是一种高度致命的神经毒剂。

The White House says the use of highly lethal nerve agent against a former Russian spy and his daughter is an outrage, but isn't ready to say Russia was responsible.

白宫表示，对一名前俄罗斯间谍和他的女儿使用高度致命的神经毒剂是一种暴行，但并未表示俄罗斯应对此负责。