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North and South Korea have exchanged gunfire in the Demilitarised Zone (DMZ) which divides the two countries.

Seoul's military said shots from the North hit a guard post in the central border town of Cheorwon. It said it returned fire and delivered a warning announcement.

Such incidents across the world's most heavily fortified border are rare.

US Secretary of State Mike Pompeo told US media the shots from the North were believed to be "accidental".

Meanwhile South Korea's Yonhap news agency quoted a government official as saying the shots were not likely to have been intentional.

No injuries were reported in the incident. Military officials in the South say there was no sign of unusual troop movements.

There's a "low possibility" that the shots fired by North Korea were intentional, according to the South Korean military. But at this stage it is unclear how they've made that assessment.

However the timing is interesting. It's just 24 hours since the North Korean leader Kim Jong-un re-appeared after a 21-day absence. There have also been a large number of military drills in the North in recent months to improve readiness to fight an "actual war", according to state media.

It was also reported that Kim Jong Un did not undergo surgery during his almost three week absence from public life, South Korean news outlet Yonhap said citing a senior government official.

The South Korean official declined to provide reasons for believing that Kim did not undergo surgery, but said speculative reports that he may have had surgery, citing some differences in his leg movements, is not true, Yonhap reported.

The last time the North opened fire on the South happened in 2017 when a North Korean soldier made a dash across the military demarcation line to defect.

The demilitarised zone (DMZ) was set up after the Korean War in 1953 in order to create a buffer zone between the two countries.

For the past two years, the government in Seoul has tried to turn the heavily fortified border into a peace zone.

Easing military tensions at the border was one of the agreements reached between the leaders of the two countries at a summit in Pyongyang in September 2018.

Source:News Agencies.