North Korea is said to have attempted to carry out another ballistic missile test which failed.
South Korean military officials say Pyongyang tried to fire a missile from the country’s east coast, but the launch did not work.
The North is banned by the UN from using any ballistic missile technology.
But in March leader Kim Jong Un ordered further tests of nuclear warheads and missiles.
“Today around (2050 GMT, Monday) North Korea attempted to launch an unidentified missile in the area of Wonsan, and our military currently presumes that it failed. That’s all I’ll say (for now),” said Jeon Ha-gyu, Chief of Public Affairs at South Korea’s Joint Chiefs of Staff.
Pyongyang is believed to have up to 30 Musudan missiles which theoretically could reach Japan but whose trials have never been successful.
Its fourth nuclear test in January was followed by several missile launches, sparking regional tension.