A North Korean embassy official and a manager of Air Koryo, the national airline, met suspects wanted for the killing of Kim Jong-nam shortly after the murder, according to video recordings shown at the trial in Kuala Lumpur on Monday.
Two women, Indonesian Siti Aisyah and Doan Thi Huong from Vietnam, and four men who are still at large have been charged in the murder of the half-brother of the North Korean leader. They are accused of using the banned chemical weapon VX to kill Kim at Kuala Lumpur airport on February 13.
Defence lawyers have said Ms Siti Aisyah and Ms Huong were duped into thinking they were playing a prank for a reality television show.
The four men, who were caught on airport camera talking to the women before they attacked Kim, were identified as North Koreans for the first time on Monday, a month since the trial began.
Three of them were seen meeting a North Korean embassy official and the Air Koryo official, both unidentified, at the main airport terminal within an hour of the attack, lead police investigator Wan Azirul Nizam Che Wan Aziz told the court.
North Korea has vehemently denied accusations by South Korean and US officials that Kim Jong-un's regime was behind the killing.
Kim Jong-nam, who was living in exile in Macau, had criticised his family's dynastic rule of North Korea and his brother had issued a standing order for his execution, some South Korean lawmakers have said.
Footage played in the courtroom showed the Air Koryo official helping the three male suspects at an airport check-in counter. He was later seen arranging a flight ticket for the fourth male suspect too, Mr Wan Azirul said.
The police investigator identified the men as North Koreans Hong Song Hac, Ri Ji Hyon, Ri Jae Nam and O Jong Gil, citing intelligence findings by the special branch of the Malaysian police.
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Mr Wan Azirul said he investigated and took statements from both the North Korean embassy and the Air Koryo official.
"They explained that the reason they were there was to assist every North Korean individual or citizen who boarded a flight to leave the country," he told the court.
The North Korean embassy in Kuala Lumpur did not respond to calls and e-mails to seek comment.
The sensational murder unravelled once-close ties between Malaysia and North Korea.
Malaysia was forced to return Kim Jong Nam's body and allow the return home of three North Korean men wanted for questioning and hiding in the Kuala Lumpur embassy, in exchange for the release of nine Malaysians stuck in Pyongyang.
Mr Wan Azirul said police intelligence also provided information on a fifth suspect identified as Ri Ji U, who was also "suspected to have the real name James", based on images and photographs taken from Ms Siti Aisyah's phone.
