North Korea has test-fired several short-range missiles off its western coast, the South Korean Yonhap news agency says. Officials in South Korea say they are checking the report.
If confirmed, the move comes a day after North Korea expelled most of the South Korean managers from a joint industrial park on the border.
That came after Seoul said it would link progress at the park with progress on the North’s denuclearisation effort.
Yonhap reported that North Korea launched missiles at 1030 local time (0130 GMT), quoting an unnamed government source.
The source said that the missiles were fired in the Yellow Sea.
Yonhap said that earlier this week Pyongyang had showed signs of preparations for testing missiles.
It said North Korea had banned ships from sailing off the coastal city of Nampo, putting a Navy boat armed with anti-ship missiles on standby in the area.