Malaysian police say on Sunday they are looking for four North Korean men who flew out of Malaysia the same day Kim Jong-nam, the half-brother of Kim Jong-un, was apparently poisoned at an airport in Kuala Lumpur. So far, four people carrying IDs from North Korea, Malaysia, Indonesia and Vietnam have been arrested

Image: Still from a South Korean TV report on the killing of Kim Jong-nam – Jeon Heon-Kyun/EPA