Kim's last moments: Shocking footage shows a 'female hit squad spray North Korean leader's brother in the face with poison' before he drops dead at a Malaysian airport 

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This shocking footage appears to show a female hit squad spray Kim Jong-un's brother in the face with poison just moments before he drops dead at a Malaysian Airport.

The CCTV video, from Kuala Lumpur International Airport, allegedly shows the moment which led to the assassination of Kim Jong-nam - the half-brother of the North Korean leader.

A woman in a while top and jeans is seen grabbing the man and holding him back, while another woman sprays a toxic substance in his face.

Later in the leaked footage, he appears to be telling security guards that he had been sprayed in the face.

Jong-nam, who often spoke out against his brother's regime, was found dead at the Malaysian airport.   

A woman in a while top and jeans is seen grabbing the man and holding him back, while another woman is sprays a toxic substance in his face

Later in the leaked footage, he appears to be telling security guards that he had been sprayed in the face

Kim Jong Nam, pictured, died shortly after the hit squad administered the poison on Monday

Meanwhile, Malaysian police have arrested a North Korean chemistry expert in connection with his murder.

Ri Jong-chol, 47, who studied medicine and chemistry in Pyongjang was detained in Kuala Lumpur in connection with the murder. 

Police are also hunting four North Korean men who flew out of Kuala Lumpur the same day Jong-nam was assassinated. 

The four suspects are believed to have been part of a hit squad sent to murder the despotic leader's half brother on the tyrant's orders. 

Malaysian police have so far arrested four people - including the chemistry expert - in connection with the murder probe.

Kim Jong Nam is believed to have been murdered in a plot using a fast-acting liquid poison. 

Malaysian police have arrested Ri Jong-chol, centre, who is believed to be a North Korean chemistry expert in connection with the murder of Kim Jong-un's half brother Kim Jong Nam

Jong-chol was arrested following a dramatic raid by Malaysian police hunting the killers

Malaysia's National Police Deputy Inspector-General Noor Rashid Ibrahim, left, said his officers have identified four North Korean men who flew out of Kualar Lumpur on the day of the murder

Kim Jong Nam, pictured, is believed to have been murdered using a fast-acting poison in Kuala Lumpur airport on February 13 on the orders of his half-brother Kim Jong-un

One of those arrested has been named by Malaysian police as Ri Jong-chol, 47, from Pyongyang. 

It is understood Jong-chol graduated in chemistry and medicine from a North Korean university in 2000, later working in chemistry research in India. 

A police source said it was too soon to conclude that Jong-chol was behind the liquid poison believed to have been used to kill Kim Jong-nam.

'He is being quized on this and he is also being questioned about the whereabouts of three accomplices who are still at large.'

One of the suspects, North Korean Hong Song Hac, left Malaysia on the day of the murder

Ri Jae Nam arrived in Malaysia on February 1 and left the country on February 13 

O Jong Gil was only in Malaysia for a week before escaping on the day of the murder

Ri Ji U is also one of the suspects who Malaysian police are looking for following the murder

Police fear, however, that three other men - said to be part of a gang of four men working with two women in Kim's murder - might have already escaped from Malaysia.

Special branch officers studying CCTV footage from Kuala Lumpur Airport, where Kim was attacked last week, have allegedly pinpointed three men aged between 30 and 50 who boarded a flight to another South East Asian country immediately after the incident.

CCTV footage shows that the suspects changed their clothes before heading to the departure hall to board their flight. 

Doan Thi Huong from Vietnam and Siti Aisyah, right from Indonesia have both been arrested

North Korean Ri Jong chol, left is believed to be a chemistry expert while Malaysian Muhammad Farid Bin Jallaludin, right, has also been detained in connection with the murder

'The suspects wore grey, purple and green clothing respectively prior to the attack,' said a police source.

'However, after the attack, they went to a restroom and changed before heading to the departure hall to board their flight.'

Police are convinced this was a pre-conceived plan as the two women allegedly involved in the attack - and who have claimed they were tricked into believing they were taking part in a TV prank - have told officers there was no sign of their male accomplices after the event.

Police also released a photograph of Vietnamese suspect Doan Thi Huong

If the arrested North Korean man, Jong-chol, was part of the assassination team, either directly or indirectly, police believe he would know the names of the three men who remain at large.

This would enable Malaysian police to alert authorities in neighbouring countries to watch for them and detain them. 

On Sunday, the Deputy National Police Chief of Malaysia, Noor Rashid Ibrahim, said four other suspects were on the run. He said the men were North Korean and had flown out of the country last Monday, when Kim died.

'I am not going disclose where they are,' he told a room packed with journalists. Interpol was helping with the investigation, he said.

The 'LOL assasin' (left)  who allegedly murdered Kim Jong-nan, right, by wiping poison on his face may have been 'duped into killing him' by 'friends who told her it was a harmless prank'

It is believed one of the attackers distracted him in the check-in queue while another 'came from behind, locked in a chokehold and administered poison'. Pictured is one of the suspects on CCTV, wearing a white top branded with LOL  

A second woman named as Siti Aishah (pictured in the passport profile image), 25, from Indonesia and her Malaysian boyfriend were arrested over the death

How the chillingly audacious murder of North Korean tyrant's brother in a major airport may have involved a poisonous handkerchief and fountain pen

Noor Rashid showed photographs of the four North Korean men police were trying to track down. They were traveling on regular - not diplomatic - passports and are aged 33, 34, 55 and 57.

He also said there was a fifth North Korean man whom authorities wanted to question.

Kim Jong Nam was waiting for his flight home to Macau when, authorities say, he was set upon by two women. He sought help at a customer service desk and said 'two unidentified women had swabbed or had wiped his face with a liquid and that he felt dizzy,' Noor Rashid said Sunday.

Kim died en route to a hospital after suffering a seizure, officials say.

Noor Rashid said Sunday that he expected autopsy results to be released within days. 'We have to send a sample to the chemistry department, we have to send a sample for toxicology tests,' he said.

Investigators also want to speak to Kim Jong Nam's next of kin to identify the body. He is believed to have two sons and a daughter with two women living in Beijing and Macau.

'We haven't met the next of kin,' Noor Rashid said. 'We are working, we are trying very hard to get the next of kin to come and to assist us in the investigation.'

The case has raised tensions between Malaysia and North Korea. Pyongyang officials have demanded custody of Kim's body and strongly objected to an autopsy, saying they will reject any results. The Malaysians went ahead with the autopsy anyway, saying they were simply following procedure.

Kang Chol, North Korea's ambassador to Malaysia, said that Malaysia may be 'trying to conceal something' and that the autopsy was carried out 'unilaterally and excluding our attendance.'