Kuala Lumpur international airport has been declared free of toxic chemicals. Malaysian authorities searched through a terminal area after it was revealed Kim Jong-nam had been murdered with the toxic nerve agent VX. The estranged brother of North Korean leader Kim Jong-un died last week after a liquid was splashed in his face by two women at the airport. The UN classes the nerve agent VX as a weapon of mass destruction. A single drop of the liquid can kill within minutes.