According to the South Korean military, ballistic missiles were launched from Kalma district. They covered a distance of 30 kilometers and fell in the Sea of Japan.
Japanese Prime Minister Shinzo Abe confirmed that there were no immediate threats for his country.
After last week's launch of two missiles, the U.S. and South Korean servicemen were combat-ready, assuming that Pyongyang could go for another launch.
This is the first such action taken by North Korea after the meeting of U.S. President Donald Trump and North Korean leader Kim Jong-un; they discussed resuming the negotiations for North Korean nuclear programs.