• South Korea has said the 47-year-old man was found by troops floating in the North's waters.
• He was then shot dead and his body was set alight, according to Seoul.
Image: BBC
North Korea's leader Kim Jong-un has issued a rare personal apology for the killing of a South Korean official, Seoul says.
Mr Kim reportedly told South Korean leader Moon Jae-in that the "disgraceful affair" should not have happened.
South Korea has said the 47-year-old man was found by troops floating in the North's waters.
He was then shot dead and his body was set alight, according to Seoul.
It is not known what the man was doing there. The South Korean government has said he may have been trying to defect to the North but his family has denied this.
The killing - the first of a South Korean citizen by North Korean forces for a decade - has caused outrage in the South.
The border between the Koreas is tightly policed, and the North is thought to have a "shoot-to-kill" policy in place to prevent coronavirus from entering the country.
What did Kim say in his apology?
The apology came in the form of a letter sent to President Moon which acknowledged that the incident should not have happened, according to South Korea's presidential office, also known as the Blue House.
Mr Kim called it a "disgraceful affair" and said he felt "very sorry" for "disappointing" Mr Moon and the South Korean people, the Blue House said. It is the North's first official comment on the incident.
The North also gave the South the results of its investigation - it said more than 10 shots were fired at the man, who had entered North Korean waters and then failed to reveal his identity and tried to flee, South Korea's director of national security Suh Hoon said.
However the North insisted that it had not burned the man's body but rather the "floating material" that was carrying him.
"The troops could not locate the unidentified trespasser during a search after firing the shots, and burned the device under national emergency disease prevention measures," Mr Suh told a briefing, referring to the North Korean account.
The presidential office in Seoul has also decided to release recent letters between the two leaders.
In them Kim Jong-un said he understood "more than anyone the kind of pressure and hardship" required to overcome the coronavirus pandemic and damage from recent typhoons. It was the "heartfelt truth" that he shared the "pain and suffering of the Southern people", he said.