South Korean Acting President Hwang Kyo-ahn said on Monday the murder of Kim Jong Nam, the estranged half-brother of Kim Jong Un, was an “act of terrorism,” the South's Prime Minister’s Office said in a written statement.

Hwang presided over a meeting of the National Security Council (NSC) at 0830 KST (2330 GMT), a day after Malaysian police named four more North Korean suspects alleged to have been directly involved in the murder and cited one identified and two unidentified North Korean suspects who are believed to still be in Malaysia.