KUALA LUMPUR: A Vietnamese identified as one of the two women allegedly responsible for the death of a Korean who is believed to be Kim Jong-Nam, the half-brother of North Korean leader Kim Jong-Un, was arrested by police today.

The woman who is in her 20's was nabbed at klia2 at about 9am by detectives on duty.

It is believed the woman is being held by Selangor police for further investigations.

With her arrest, it is learnt that police have reclassified the case from sudden death to murder.

She was apparently staying at a hotel in Bandar Baru Salak Tinggi since the death of the Korean and it is being investigated why she had turned up at the klia2 today.

She is among six suspects comprising two women and four men who are being sought after by police in the case.

Sources said the images of the suspects who are believed to be aged between 20 and 50 were captured by closed-circuit television cameras (CCTV) at klia2 on Monday morning when the victim died in what is said to be an assassination.

Police have also detained a taxi driver who ferried the two women out of klia2 soon after the incident.

Although it was initially thought that the victim had died of natural causes, investigators who had perused evidence and clues such as CCTV footage strongly believe his death was pre-meditated.

Police are almost certain the man is Jong-Nam but have declined to confirm this as it had to conform to formalities such as clinical evidence in substantiating the real identity of the victim whose passport identified him as Kim Chol, 46.

Earlier, Deputy Inspector-General of Police Tan Sri Noor Rashid Ibrahim told theSun the case currently remains as sudden death but it will be re-classified as murder if findings in the post mortem showed there was foul play in his death.

"It will all depend on the post-mortem report. It is not ready. We will wait for the outcome before deciding if the case should be treated as murder or remain classified as sudden death. I cannot reveal more as it may jeopardise our investigations." he told theSun.

Noor Rashid confirmed a taxi driver was held and was being interviewed by police but he appeared not to be involved in the alleged plot.

News worldwide reported that Jong Nam was killed in a high-level assassination plot when he was about to board a flight to Macau at klia2 on Monday.

The victim had apparently told airport staff that he felt sick after being sprayed with a liquid by unknown individuals moments earlier.

He was examined by a doctor at a clinic at klia2 before being referred to the Putrajaya Hospital for further treatment.

However, he died on the way to the hospital.