Malaysian authorities are trying to determine if the banned nerve agent VX found to be used in Kim Jong Nam's murder may have posed any kind of wider public danger.

North Korean leader Kim Jong Un's half brother was killed at Kuala Lumpur airport last week when his face was exposed to the agent, apparently by two women.

The Associated Press quotes Malaysian police chief Khalid Abu Bakar as saying one of the two female suspects who attacked Kim Jong-nam has been vomiting while in custody, a possible symptom of VX exposure.

Malaysian police say the two women smeared Kim's face with their bare hands, but haven't determined yet whether the women actually had VX on their hands or separate precursor chemicals which combined at the last moment on the victim's skin.

In either case, experts say the women could prevent their own poisoning deaths by taking an antidote immediately before or after the attack.

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