North Korea said Wednesday it had successfully carried out its first hydrogen bomb test, marking a major step forward in its nuclear development, if confirmed.
People watch a news report on North Korea's first hydrogen bomb test at a railroad station in Seoul on January 6, 2016. (AFP)
People walk by a screen showing the news reporting about an earthquake near North Korea's nuclear facility, in Seoul, South Korea, Wednesday, Jan. 6, 2016. (AP)
South Koreans watch a TV news program showing North Korean leader Kim Jong Un's New Year speech, at the Seoul Railway Station in Seoul, South Korea, Friday, Jan. 1, 2016. (AP)