Seoul accused North Korea yesterday of a "blatant lie" in claiming it had not fired shells near a South Korean warship and said Pyongyang had threatened to bombard its military vessels.
Earlier yesterday, the North's military had rejected as "sheer fabrication" Seoul's assertion that it fired two shells in the vicinity of a South Korean navy vessel on patrol near the tense sea border on Thursday.
Seoul's defence ministry said the shells fell about 150 metres away from the South Korean Navy corvette near the disputed border in the Yellow Sea.
The ship was not damaged and responded by firing five rounds into waters near a North Korean military vessel.
"The verified fact is that the puppet navy vessel, which intruded deeply into our waters under the pretence of controlling Chinese fishing boats, fired recklessly and lied that we had fired first. This is a sheer fabrication", the North's military Western Front Command said in an official statement.
"All the troops under the Western Front Command are well prepared to crush ruthlessly the aggravating provocative acts by the puppet military gangsters in the name of all the people".
It then vowed to turn the tense sea border area into "tombs" for the South's military.
But South Korean defence ministry spokesman Kim Min-seok stood by Seoul's charges and dismissed the North's claim.
"North Korea's such far-fetched claims are nothing but a blatant lie … and are subject to ridicule by the international community," he told journalists.
A South Korean military Joint Chiefs of Staff spokesman said yesterday the North continuously sent messages through an international radio channel, threatening attacks on the South's military vessels operating near the sea border.
"Recently, it has been threatening to bombard our ships unless they pull back" from the sea border, he said.
South Korean President Park Geun-hye yesterday expressed "very strong regret" that North Korea committed this "provocation" at a time when South Koreans are in grief over last month's ferry sinking, her spokesman Min Kyung-wook said.
The build-up to the incident started Tuesday when a South Korean naval ship fired warning shots to turn back three North Korean patrol boats that crossed the disputed sea boundary.
North Korea then threatened on Wednesday to launch an attack on South Korean warships without warning at the slightest hint of any provocative act, claiming the North Korean patrol boats were controlling illegal Chinese fishing boats north of the unmarked border.
The North does not recognise the United Nations-designated Northern Limit Line as a sea border.