North Korea on Sunday announced the successful test of a hydrogen bomb that can be placed on an intercontinental ballistic missile (ICBM), in a broadcast on Korean Central Television (KCTV) at 1500 local time.

The test represents North Korea’s sixth in history. Pyongyang previously conducted nuclear tests in 2006, 2009, 2013, and two in 2016, with explosive yields of less than one kiloton, 2-4 kilotons, 6-9 kilotons, 7-10 kilotons, and 20-30 kilotons, respectively.

Announcer Ri Chun Hee read a statement from the Nuclear Weapons Institute of the DPRK regarding the “perfect success” of a “hydrogen bomb for intercontinental ballistic