PYONGYANG, Jan. 6, 2016 -- Photo taken on Jan. 6, 2016 shows Pyongyang citizens gathering in front of a big screen at Pyongyang Railway Station in Pyongyang, capital of the Democratic People's Republic of Korea (DPRK), to follow news report on the hydrogen bomb test. The Democratic People's Republic of Korea (DPRK) announced Wednesday that it has successfully carried out its first hydrogen bomb test. (Xinhua/Lu Rui)