North Korean ambassador delusional, spewing lies, says Anifah

The substance is technically known as ethyl "S-2-diisopropylaminoethyl methylphosphonothiolate", a police statement said.

The CDC said it was possible that any visible VX liquid contact on the skin, unless washed off immediately, would be lethal.

Traces of the nerve agent were found from swabs of the face and eyes, the release said.

"The ambassador has been informed of the process involved [in the police investigation], but he continues to be delusional, and spew lies and accusations against the government of Malaysia", Malaysian Minister of Foreign Affairs Anifah Aman said. The production and stockpiling of more than 100 grams per year was outlawed by the Chemical Weapons Convention of 1993.

Mr Khalid revealed on Friday that one of the women who was arrested had suffered from the effects of the chemical and had been vomiting.

Datuk Seri Dr Shahidan Kassim told North Korea that Malaysia should be given the space to carry out the probe as it was a sovereign nation with its own laws.

The only known use of VX is as a chemical warfare agent and the U.S. government's Centers for Disease Control and Prevention (CDC) describes it as the "most potent" of all nerve agents. Asked Friday in a text message whether that was still the case, Khalid said, "We are doing it now".

The four men are believed to be back in North Korea, but police also want to question three other people still in Malaysia, including Hyon Kwang Song, a second secretary at the North Korean Embassy. At least one claimed she was tricked into participating in the attack, the AP said.

At the moment, there is a lot of suspicion that North Korea was responsible for the attack, however the country denies this.

The agent is deadly if inhaled and can also entry a person's body through the skin.

VX has been used in an assassination before, in 1995 when the Japanese Aum Shinrikyo cult sprayed it on a businessman it believed was spying on its activities.

North Korea's ambassador to Kuala Lumpur has said the Malaysian investigation can not be trusted, and that the three suspects that have been detained should be released immediately.

A regional security expect said the VX nerve agent could have easily been smuggled via a diplomatic pouch which are not subject to regular checks by customs officials. He died before reaching a hospital. As a career diplomat, Choe served as an aide and interpreter during the six-party talks on North Korea's nuclear weapons program and other high-level meetings, including former US President Bill Clinton trip to Pyongyang in 2009.

Malaysian police said the victim was poisoned to death at Kuala Lumpur's global airport as he was waiting for a flight to Macao, China.

  • Joanne Flowers