The investigation has unleashed a serious diplomatic fight between Malaysia and North Korea, a prime suspect in the February 13 killing of Kim Jong Nam at Kuala Lumpur's airport.
Yesterday's revelation by Malaysian police that the banned chemical weapon VX nerve agent was used to kill Kim raised the stakes significantly in a case that has broad geopolitical implications.
Experts say the nerve agent used in the attack was almost certainly produced in a sophisticated state weapons laboratory and is banned under an international treaty. But North Korea never signed that treaty, and has spent decades developing a complex chemical weapons program.
Malaysia said earlier in the week that Hyon Kwang Song, a second secretary at the North Korean Embassy in Kuala Lumpur, was wanted for questioning. But authorities at the time acknowledged that he has diplomatic immunity and that they couldn't compel him to appear.
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Today, Malaysia's tone changed. Abdul Samah Mat, the police chief leading the investigation, said authorities would give the diplomat "reasonable" time to come forward.
Lawyer Sankara Nair, however, said diplomats have immunity privileges even in criminal cases.
"If he is a Korean diplomat with a diplomatic passport, then he has immunity no matter a criminal case or otherwise," he said. "Police can apply for a warrant, but it can easily be set aside by the embassy."
Malaysia hasn't directly accused the North Korean government of being behind the attack, but officials have said four North Korean men provided two women with poison to carry it out.
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