A North Korean man turned up at a house on a South Korean island Friday having apparently succeeded in defecting overnight via a rare and dangerous sea border crossing.

The man knocked on the door of a home on Gyodong island at 3:40 am (1840 GMT Thursday) and identified himself as a defector from the North, military authorities said.

He is in custody and being questioned, a defence official told AFP, adding that it was not immediately clear "how he made the crossing" during a stormy night with powerful tides.

Defections across the sea or land border between the two Koreas are rare. Most defectors flee to China and then a third country such as Thailand before coming to the South.

In September last year, a North Korean man made it to Gyodong island by clinging to a log that he said had been swept out to sea by flood waters.

A month later, a North Korean soldier cut his way undetected through rows of electrified fencing on the land border.

The two incidents, which came at a time of heightened military tension, sparked public concerns about security lapses and led to the dismissal of a South Korean army division commander and two field commanders from their posts.

North, South Korea hold talks on family reunions
Seoul (AFP) Aug 23, 2013 - North and South Korea held talks Friday on resuming reunions for families separated for decades by the 1950-53 Korean War as they seek to build on a recent easing of cross-border tensions.

The reunion programme was suspended after the North's shelling of a South Korean border island in November 2010, and its resumption after three years would mark a symbolic but important step.

The talks, between North and South Korean Red Cross officials, took place in the border "truce" village of Panmunjom, where the 1953 ceasefire ending hostilities was signed.

"The issue of separated families is one of the most urgent tasks," the head of the South's Red Cross delegation told reporters on his way to the venue.

"I will do my best to relieve their pain," he was quoted as saying by the Yonhap news agency.

An official with the South's Unification Ministry said the morning session focused on the date and venue of any initial reunion, as well as the number of family members who might be selected to take part.

The talks were almost derailed by a debate over the venue, with the North wanting the meeting to be held at its Mount Kumgang resort.

As well as the family reunions, the North is keen to restart South Korean tours to Mount Kumgang, but Seoul insists that the two issues should not be linked together.

The South suspended the tours in 2008 after a North Korean soldier shot dead a female tourist who strayed into a restricted zone.

The push to restart the reunions was initiated last week by South Korean President Park Geun-Hye, who urged Pyongyang to "open its heart" and agree to kickstart the programme in time for next month's Chuseok holiday -- when Korean families traditionally gather together.

Millions of Koreans were left separated by the war, which sealed the peninsula's division. Most have died without having had a chance to meet family members last seen six decades ago.

About 72,000 South Koreans -- nearly half of them aged over 80 -- are still alive and wait-listed for a chance to join the highly competitive family reunion events, which select only up to a few hundred participants each time.

At the reunions, North and South Koreans typically meet in the North for two or three days before the South Koreans -- many in tears -- head home again.

For those too infirm to travel, reunions via video conferencing have been arranged in recent years.

The reunion programme began in 2000 following an historic inter-Korean summit. Sporadic events since then have seen around 17,000 people briefly reunited.

The last such meeting took place in late 2010, before the North's shelling of Yeonpyeong island.

Inter-Korean relations have showed signs of improving recently after months of heightened military tensions that followed the North's nuclear test in February.

The two sides have already agreed to work on reopening their Kaesong joint industrial zone shut down in April, and the South has accepted Pyongyang's proposal for talks on the Mount Kumgang tours -- although not until late September.

Seoul has sought to play down expectations of a sudden turnaround in relations with the North, saying the recent breakthroughs are just the start of what will be a long, incremental progress.

President Park has also made it clear that any substantial dialogue on strategic issues can only take place if North Korea offers a tangible commitment to abandon its nuclear weapons programme.

Pyongyang has said it will never allow its nuclear deterrent to be used as a bargaining chip.