Officials from North and South Korea met on Wednesday for talks on how to prevent floods along a river running through their heavily armed border, an official said.

The two sides opened talks in the North Korean border town of Kaesong, Unification Ministry spokesman Chun Hae-sung said without elaborating.

The meeting comes a month after North Korea released a massive amount of water from a dam into the Imjin River without advance notice, triggering floods that swept six South Koreans camping and fishing to their deaths.

North Korea has said it "urgently" had to release water because the water level at the dam was too high and it would warn Seoul of similar dam releases in the future, but it has remained silent on Seoul's demand for an apology.

"We will make efforts to achieve good results regarding" the incident, South Korean chief delegate Kim Nam-sik told reporters before departing to the North. Kim did not elaborate on whether Seoul will renew its demand for an apology during the meeting.

The discussions today took place amid reports that the North Korea appears to be preparing to test-fire more missiles following a barrage of missile launches off its east coast on Monday - the regime's first since early July.