The Latest: Report says North may be readying missile launch

South Korean army soldiers prepare barbed wires during a military exercise in Paju, South Korea, near the border with North Korea, Monday, Sept. 4, 2017. Following U.S. warnings to North Korea of a "massive military response," South Korea's military on Monday fired missiles into the sea to simulate an attack on the North's main nuclear test site a day after Pyongyang detonated its largest ever nuclear test explosion. (AP Photo/Ahn Young-joon) South Korean army soldiers prepare barbed wires during a military exercise in Paju, South Korea, near the border with North Korea, Monday, Sept. 4, 2017. Following U.S. warnings to North Korea of a "massive military response," South Korea's military on Monday fired missiles into the sea to simulate an attack on the North's main nuclear test site a day after Pyongyang detonated its largest ever nuclear test explosion. (AP Photo/Ahn Young-joon)

By Associated Press September 4, 2017 7 min read

SEOUL, South Korea (AP) – The Latest on North Korea’s nuclear test and the world reaction (all times local):

3:20 p.m.

South Korean media says Seoul’s military believes North Korea is readying the launch of a ballistic missile, possibly an ICBM.

Yonhap news agency reports that Seoul’s defense ministry also measures North Korea’s nuclear test at 50 kilotons. The detonation Sunday was the strongest ever from the North, which claimed the test was of a hydrogen bomb.

South Korea responded to the nuclear test with live-fire drills off its eastern coast Monday that were meant to simulate an attack on the North’s main nuclear test site.