The Malaysian police said on Sunday that four suspects from the Democratic People's Republic of Korea (DPRK) related to the death of a DPRK man had fled the country.

The cause of death of the DPRK man still remained unknown, Deputy Inspector-General of Police Noor Rashid Ibrahim told a press conference.

The 46-year-old man, who was found dead on Monday at the Kuala Lumpur airport, is believed to be Kim Jong Nam, the elder brother of DPRK's top leader Kim Jong Un.

But Ibrahim said they still need DNA samples from the next-of-kin of Kim to identify the dead man.