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North Korean troops have fired across the border into South Korean territory, reports say.
The shooting occurred in Hwacheon, some 90km (56 miles) north-east of the South's capital, Seoul, according to reports from South Korea's YTN TV.
Yonhap news agency said two shots were aimed at a South Korean military unit.
The Reuters news agency quoted a defence ministry official in Seoul as confirming that the shooting had taken place.
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The news agency reports that South Korea's Joint Chief of Staff said that the two states had exchanged fire.
Media reports said North Korea had fired two rounds towards a frontline unit in Hwacheon, in the eastern province of Gangwon.
The incident comes as Seoul prepares to host a meeting of world leaders from the G20 group of nations on 11 and 12 November.
The border between the two Koreas is one of the most heavily fortified in the world, with many thousands of troops station on either side of a demilitarised zone.
There have been frequent incidents at sea, but this is believed to be the first cross-border shooting on land since 2006.
Tensions between the two rivals have been high since the South accused the North of torpedoing one of its warships in March, with the loss of 46 lives.
Earlier on Friday the North warned that relations with its neighbour would face a "catastrophic impact" if South Korea continued to reject talks aimed at easing tension.
The first round of discussions in two years ended without progress in September after Seoul demanded an apology from Pyongyang for the warship sinking.
This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.
North Korean troops have fired across the border into South Korean territory, reports say.
The shooting occurred in Hwacheon, some 90km (56 miles) north-east of the South's capital, Seoul, according to reports from South Korea's YTN TV.
Yonhap news agency said two shots were aimed at a South Korean military unit.
The Reuters news agency quoted a defence ministry official in Seoul as confirming that the shooting had taken place.
Related stories
The news agency reports that South Korea's Joint Chief of Staff said that the two states had exchanged fire.
Media reports said North Korea had fired two rounds towards a frontline unit in Hwacheon, in the eastern province of Gangwon.
The incident comes as Seoul prepares to host a meeting of world leaders from the G20 group of nations on 11 and 12 November.
The border between the two Koreas is one of the most heavily fortified in the world, with many thousands of troops station on either side of a demilitarised zone.
There have been frequent incidents at sea, but this is believed to be the first cross-border shooting on land since 2006.
Tensions between the two rivals have been high since the South accused the North of torpedoing one of its warships in March, with the loss of 46 lives.
Earlier on Friday the North warned that relations with its neighbour would face a "catastrophic impact" if South Korea continued to reject talks aimed at easing tension.
The first round of discussions in two years ended without progress in September after Seoul demanded an apology from Pyongyang for the warship sinking.
This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.