Malaysian police said Sunday that four North Korean suspects in the murder of the estranged half brother of North Korean leader Kim Jong Un fled Malaysia on the day of the killing.

The four North Koreans flew out of Malaysia, but police would not reveal the flight's destination, just that they were coordinating with Interpol to track them down.

Malaysian police on Friday arrested a North Korean man in connection to the murder of Kim Jong Nam, while a Vietnamese woman and an Indonesian woman have also been arrested. A Malaysian man is being detained to facilitate the investigation.