US consulate attack in Libya: death of US ambassador would be act of war. The armed mob that stormed the US consulate in Benghazi, killing the American ambassador, struck at a moment loaded with symbolism. The assault took place on the 11th anniversary of the terrorist attacks on September 11. President Obama will come under overwhelming pressure to respond. Put bluntly, the destruction of diplomatic premises resulting in the murder of an ambassador would amount to an act of war.