North Korea has blown up a joint liaison office with the South near the North's border town of Kaesong.

The move comes just hours after the North renewed threats of military action at the Korean border.

The site was opened in 2018 to help the Koreas - officially in a state of war - to communicate. It had been empty since January due to Covid-19 restrictions.

In a statement, South Korea warned it would "respond strongly" if the North "continues to worsen the situation".

The destruction of the office, it said, "abandons the hopes of everyone who wanted the development of inter-Korean relations and peace settlement in the Korean Peninsula".

"The government makes it clear that all responsibility of this situation lies in the North."

Tensions between North and South Korea have been escalating for weeks, prompted by defector groups in the South sending propaganda across the border.

Why did North Korea destroy the liaison office?
North Korea's state-run Korean Central News Agency (KCNA), using characteristically emphatic language, said the bombing of the building reflected "the mindset of the enraged people to surely force human scum and those, who have sheltered the scum, to pay dearly for their crimes".

The North Korean leader's sister, Kim Yo-jong - considered a close and powerful ally - threatened to demolish the office in a statement at the weekend.

Her brother, Kim Jong-un, has ruled North Korea as Supreme Leader since 2011.

South Korea's Unification Ministry in Seoul confirmed that at 14:49 local time (05:49 GMT) there was an explosion.

In recent weeks, North Korea has repeatedly condemned the South for allowing propaganda into its territory.

Defector groups regularly send such material via balloons, or even drones, into the North.

Last Tuesday, Pyongyang announced it was severing all official communication links with Seoul.

Over the weekend, Kim Yo-jong threatened to send troops into the demilitarised zone (DMZ) at the inter-Korean border.

Then, before the explosion on Tuesday, the military leadership confirmed it was ready to "turn the frontline into a fortress".

"North Korea's violent destruction of the liaison office at Kaesong is a symbolic blow to inter-Korean reconciliation and co-operation," said Leif-Eric Easley, a professor at Ewha University in Seoul.

"It's hard to see how such behaviour will help the Kim regime get what it wants from the world, but clearly such images will be used for domestic propaganda."

Analysts say Pyongyang may also be seeking to create a crisis to increase its leverage as nuclear negotiations with the US are at a standstill.

North and South Korea are technically still at war because no peace agreement was reached when the Korean War ended in 1953.

What is the Kaesong liaison office?
The border town of Kaesong has for years been a symbol of the fragile relationship between North and South Korea.

In 2003, it sprung to life as the site of an industrial zone - the Kaesong Industrial Complex - which was set up between the North and South.

At its peak, it saw more than 120 factories, employing more than 50,000 North Koreans and hundreds of managers from the South.

But in 2016 it was shut down after political tensions reached a head - bringing to a halt a symbol of co-operation.

So, in 2018, it looked like things were back on track when both Koreas agreed to set up an inter-Korean liaison office in Kaesong.

It allowed officials from the North and South to communicate on a regular basis for the first time since the Korean War, and was meant to be staffed by up to 20 people from each side.

But in March 2019, North Korea announced that it was withdrawing from the office - following a failed summit between the US and North Korea.

Who is Kim Yo-jong?
In recent years the younger sister of Kim Jong-un has emerged as his close and powerful ally.

From 2014, Kim Yo-jong's main job was to protect her brother's image, taking up a key role in the party's propaganda department.

When, in 2017, she was elevated to an alternate member of the politburo, it seemed to indicate a shift in seniority - although her main role remained in propaganda.

In 2018, she shot into the international spotlight when, at the Winter Olympics, she became the first member of the Kim family to visit South Korea.

Her continued rise shows she has gained the deep trust of her brother, and when Mr Kim's disappearance in April prompted questions about his health, she was touted as a possible successor.

In recent weeks, she has been responsible for delivering several strongly-worded messages against the South - and has emerged as North Korea's new point-person on inter-Korean affairs, according to specialist site NK News.

However, North Korea's power mechanisms are notoriously difficult to understand.

It's therefore hard to gauge how much power - or how much of her own political network - the 32-year-old might have.

https://www.bbc.com/news/world-asia-53060620?iorg_service_id_internal=624173547714020%3BAfpwMyGvGK1PDWuS

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