Malaysia's health minister has said Kim Jong-nam died within '15 to 20 minutes' after he was poisoned with toxic chemicals.

The half brother of the North Korean ruler, Kim Jong-un, died at Kuala Lumpur's airport on February 13 after his face was splashed with banned chemical weapon VX.

Now Subramaniam Sathasivam has said the dose of VX given to Kim was so high that it 'would have affected his heart, it would have affected his lungs, it would have affected everything.'

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Kim Jong-nam died on February 13 and now police say a nerve agent was found on his face

A video was posted on YouTube appearing to show the women approaching Kim Jong Nam and spraying the substance in his face

Doan Thi Huong, who is accused of murdering him, was captured walking through the airport on CCTV

Only 10 milligrams of VX is required to be lethal, but Mr Sathasivam added he believed the dosage given to Kim was 'more than that'.

Two female suspects in their mid to late 20s, a Vietnamese escort, Doan Thi Huong, and an Indonesian massage parlour worker, Siti Aishah, are being interrogated by Malaysian police.

The women have claimed they thought they had been recruited to play a part in a jokey TV show where members of the public would have a liquid sprayed in their faces.

Aishah said she believed the liquid was just baby oil and she had been paid £72 to take part in the 'prank'.

Indonesia's deputy ambassador to Malaysia, Andreano Erwin, told reporters yesterday: 'She didn't know it was poison. That is the answer from her.

She previously worked as an escort, taking wealthy men around town. She has claimed she thought she was taking park in a gameshow

She had a Facebook account under the name Ruby Ruby and posted pictures of herself wearing a revealing red swim suit

Malaysian police said the two women allegedly involved in the assassination - Siti Aishah (left) and Huong (right) - knew the poisoning wasn't a 'TV prank'

Shocking pictures show Kim Jong-nam slumped in a chair having been poisoned

'She only said in general that somebody had asked her to do it and she didn't know what would happened next.

'She mentioned some names but I did not recognise them. The names were very general…James, Jang, that's it.'

Earlier today, Malaysian Police completed a sweep of the airport terminal where Kim had died.

The sweep involved officers from the police's chemical, biological, radiological and nuclear teams, as well as the fire department's hazardous materials unit and the government's atomic energy board.

Senior police official Abdul Samah Mat confirmed they found no trace of the nerve agent and declared it a 'safe zone'.

More than a dozen officers in protective gear conducted the two-hour sweep early Sunday.

Scores of members of the hazmat (hazardous materials) team were seen conducting checks at the Kuala Lumpur International Airport

The crews were gathered at the main hall of airport in Sepang, Malaysia, last night to start their search

Where the deadly chemical came from - whether it was brought into the country by a North Korean agent or was produced locally - was still being investigated