Malaysian authorities and Interpol are on the hunt for four North Korean men who flew out of Malaysia on the same day that Kim Jong-nam, the half-brother of North Korean leader Kim Jong-un, died after being poisoned at an airport in the capital, Kuala Lumpur.

Since Kim's death last week, authorities have been trying to piece together details of what appeared to be an assassination.

Malaysian authorities have so far arrested four suspects carrying IDs from North Korea, Malaysia, Indonesia and Vietnam.