North Korea has fired short-range missiles into international waters in the Yellow Sea as part of a routine military exercise, a defence ministry official said Wednesday.

The missiles were fired on Tuesday, the official told AFP on condition of anonymity, adding the type and number were unclear.

"The latest missile launch was seen as part of routine military exercises," he said.

Yonhap news agency said two missiles were fired in the first such launch since March.

"North Korea had designated an off-limit zone for vessels in the Yellow Sea before it fired missiles," it quoted a source as saying.

"It appears to have fired KN-02 or Styx missiles into the international sea from North Korean waters."

The North has carried out short-range missile test-launches many times before.

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