North Korea on Monday fired five short-range missiles into the sea off its east coast - the latest in a series of missile launches ordered by leader Kim Jong-Un amid rising military tensions.
North Korea ordered all South Koreans to leave the jointly-run Kaesong industrial zone immediately and announced it was seizing all materials left in the complex.
North Korea said it had successfully put a satellite into orbit, with a rocket launch widely condemned as a disguised ballistic missile test for a weapons delivery system to strike the US mainland.
The US sent a heavy bomber over South Korea on Sunday in a show of force as North Korean leader Kim Jong-Un insisted his country's latest nuclear test was carried out in self-defence.
South Korea resumed high-decibel propaganda broadcasts into North Korea as the US ramped up pressure on China to bring Pyongyang to heel after its latest nuclear test.
The UN Security Council is considering imposing further sanctions on North Korea after it carried out a nuclear test, the British ambassador said Wednesday.