North Korea to launch another intercontinental ballistic missile

North Korea is preparing to launch an intercontinental ballistic missile (ICBM) amid international condemnation of Pyongyang's announcement that it had tested a hydrogen bomb.

South Korean military sources have said that there are indications that Kim Joug Un will again test a ballistic missile.Seoul's defence ministry also measured North Korea's nuclear test at 50 kilotons, the Yonhap News Agency reported.

South Korea's Parliament called defence ministry to answer questions about North Korea's sixth and largest nuclear test that was carried out on Sunday and the detonation was the strongest ever from the North, which claimed the test was of a hydrogen bomb.

South Korea's defence ministry said in a parliament hearing it was still seeing signs North Korea planned to stage more ballistic missile launches, possibly including an intercontinental ballistic missile.

"We have continued to see signs of possibly more ballistic missile launches. We also forecast North Korea could fire an intercontinental ballistic missile," Independent quoted Chang Kyung-soo, a defence ministry official, as saying.

Following U.S. President Donald Trump warnings to North Korea of a "massive military response," South Korea's military fired missiles into the sea to simulate an attack on the North's main nuclear test site.

In a series of tweets, U.S. President Donald Trump threatened to halt all trade with countries doing business with the North, a veiled warning to China, and faulted South Korea for what he called "talk of appeasement.