Earlier today North Korea published pictures of its leader Kim Jong Un admiring a thermonuclear device or H-bomb. Hours later it tested such a bomb in an underground explosion. The North Korean news agency announced:

Pyongyang, September 3 (KCNA) -- Respected Supreme Leader Kim Jong Un guided the work for nuclear weaponization on the spot.

He was greeted by senior officials of the Department of Munitions Industry of the Central Committee of the Workers' Party of Korea (WPK) and scientists of the Nuclear Weapons Institute before being briefed on the details of nuclear weaponization.
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He watched an H-bomb to be loaded into new ICBM.