大象传媒

Police in Malaysia say one of the world's most deadly nerve agents was used to kill the brother of the North Korean leader at Kuala Lumpur international airport. The substance, known as VX is classified by the UN as a weapon of mass destruction and one-hundredth of a gram is enough to kill. Eleven days after the attack the Malaysian authorities are checking the airport for traces of the substance and are also testing for radioactive materials.

Dr Bruce Bennett is a senior Analyst at the Rand Corporation, a US-based think-thank

(Picture: CCTV footage shows the exiled half-brother of the North Korean leader gesturing towards his face while talking to security at Kuala Lumpur International Airport. Kim Jong-nam reportedly told them a woman had sprayed chemicals on his face. Credit: Fuji Television via AP)