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North Korea leader, Kim Jong Un’s half-brother, Kim Jong Nam was assassinated on Monday at a ‘busy airport’ in Malaysia.

With mystery still surrounding the murder, Malaysian police are checking surveillance cameras for clues.

The death of Kim Jong Nam rippled across Asia on Wednesday as police looked at CCTV footage for clues about the two female assailants and rival South Korea said Pyongyang had been trying to kill him for five years.

The 46-year-old was targeted on Monday in a shopping concourse at Kuala Lumpur International Airport. He had not yet gone through security.

Kim, who died on the way to a hospital, told medical workers before he died that he had been attacked with a chemical spray, a senior government official said.

South Korea’s spy service said on Wednesday that North Korea had been trying for five years to kill him, citing Kim Jong Un’s “paranoia” about his estranged half-brother.

Kim Jong Nam had been tipped by some outsiders as a possible successor to his dictator father, although others thought that was unlikely because he lived outside the country, including recently in Macau, Singapore and Malaysia.

Multiple South Korean media reports said he was killed at the airport by two women believed to be North Korean agents. They fled in a taxi and were being sought by Malaysian police.