US President Trump and North Korean leader Kim hold talks

Seoul, Jun 16: North Korea blew up an inter-Korean liaison office on its side of the border on Tuesday, the South's Unification Ministry said, after days of increasingly virulent rhetoric from Pyongyang.

"North Korea blows up Kaesong Liaison Office at 14:49," the ministry, which handles inter-Korean relations, said in a one-line alert sent to reporters.

The statement came minutes after an explosion was heard and smoke seen rising from the long-shuttered joint industrial zone in Kaesong where the liaison office was located, Yonhap news agency reported citing unspecified sources.

Its destruction came after Kim Yo Jong, the powerful sister of North Korean leader Kim Jong Un, said at the weekend: "Before long, a tragic scene of the useless north-south joint liaison office completely collapsed would be seen."

Since early June, North Korea has issued a series of vitriolic condemnations of the South over activists sending anti-Pyongyang leaflets over the border -- something defectors do on a regular basis.

Last week it announced it was severing all official communication links with South Korea.

The leaflets -- usually attached to hot air balloons or floated in bottles -- criticise North Korean leader Kim Jong Un for human rights abuses and his nuclear ambitions.

Analysts say Pyongyang may be seeking to manufacture a crisis to increase pressure on Seoul while nuclear negotiations with Washington are at a standstill.

Earlier Tuesday, North Korea's army said it was "fully ready" to take action against the South, included re-entering areas that had been demilitarised under an inter-Korean agreement.

"North Korea is frustrated that the South has failed to offer an alternative plan to revive the US-North talks, let alone create a right atmosphere for the revival," said Cheong Seong-chang, a director of the Sejong Institute's Center for North Korean Studies.

"It has concluded the South has failed as a mediator in the process."

The coronavirus can stay aloft for hours in tiny droplets in stagnant air, infecting people as they inhale, mounting scientific evidence suggests.

This risk is highest in crowded indoor spaces with poor ventilation, and may help explain superspreading events reported in meatpacking plants, churches and restaurants.

It’s unclear how often the virus is spread via these tiny droplets, or aerosols, compared with larger droplets that are expelled when a sick person coughs or sneezes, or transmitted through contact with contaminated surfaces, said Linsey Marr, an aerosol expert at Virginia Tech.

Follow latest updates on the Covid-19 pandemic here

Aerosols are released even when a person without symptoms exhales, talks or sings, according to Marr and more than 200 other experts, who have outlined the evidence in an open letter to the World Health Organization.

What is clear, they said, is that people should consider minimizing time indoors with people outside their families. Schools, nursing homes and businesses should consider adding powerful new air filters and ultraviolet lights that can kill airborne viruses.

What does it mean for a virus to be airborne?

For a virus to be airborne means that it can be carried through the air in a viable form. For most pathogens, this is a yes-no scenario. HIV, too delicate to survive outside the body, is not airborne. Measles is airborne, and dangerously so: It can survive in the air for up to two hours.

For the coronavirus, the definition has been more complicated. Experts agree that the virus does not travel long distances or remain viable outdoors. But evidence suggests it can traverse the length of a room and, in one set of experimental conditions, remain viable for perhaps three hours.

How are aerosols different from droplets?

Aerosols are droplets, droplets are aerosols — they do not differ except in size. Scientists sometimes refer to droplets fewer than 5 microns in diameter as aerosols. (By comparison, a red blood cell is about 5 microns in diameter; a human hair is about 50 microns wide.)

From the start of the pandemic, the WHO and other public health organizations have focused on the virus’s ability to spread through large droplets that are expelled when a symptomatic person coughs or sneezes.

These droplets are heavy, relatively speaking, and fall quickly to the floor or onto a surface that others might touch. This is why public health agencies have recommended maintaining a distance of at least 6 feet from others, and frequent hand washing.

But some experts have said for months that infected people also are releasing aerosols when they cough and sneeze. More important, they expel aerosols even when they breathe, talk or sing, especially with some exertion.

Scientists know now that people can spread the virus even in the absence of symptoms — without coughing or sneezing — and aerosols might explain that phenomenon.

Because aerosols are smaller, they contain much less virus than droplets do. But because they are lighter, they can linger in the air for hours, especially in the absence of fresh air. In a crowded indoor space, a single infected person can release enough aerosolized virus over time to infect many people, perhaps seeding a superspreader event.

For droplets to be responsible for that kind of spread, a single person would have to be within a few feet of all the other people, or to have contaminated an object that everyone else touched. All that seems unlikely to many experts: “I have to do too many mental gymnastics to explain those other routes of transmission compared to aerosol transmission, which is much simpler,” Marr said.

Can I stop worrying about physical distancing and washing my hands?

Physical distancing is still very important. The closer you are to an infected person, the more aerosols and droplets you may be exposed to. Washing your hands often is still a good idea.

What’s new is that those two things may not be enough. “We should be placing as much emphasis on masks and ventilation as we do with hand washing,” Marr said. “As far as we can tell, this is equally important, if not more important.”

Should I begin wearing a hospital-grade mask indoors? And how long is too long to stay indoors?

Health care workers may all need to wear N95 masks, which filter out most aerosols. At the moment, they are advised to do so only when engaged in certain medical procedures that are thought to produce aerosols.

For the rest of us, cloth face masks will still greatly reduce risk, as long as most people wear them. At home, when you’re with your own family or with roommates you know to be careful, masks are still not necessary. But it is a good idea to wear them in other indoor spaces, experts said.

As for how long is safe, that is frustratingly tough to answer. A lot depends on whether the room is too crowded to allow for a safe distance from others and whether there is fresh air circulating through the room.

What does airborne transmission mean for reopening schools and colleges?

This is a matter of intense debate. Many schools are poorly ventilated and are too poorly funded to invest in new filtration systems. “There is a huge vulnerability to infection transmission via aerosols in schools,” said Don Milton, an aerosol expert at the University of Maryland.

Most children younger than 12 seem to have only mild symptoms, if any, so elementary schools may get by. “So far, we don’t have evidence that elementary schools will be a problem, but the upper grades, I think, would be more likely to be a problem,” Milton said.

College dorms and classrooms are also cause for concern.

Milton said the government should think of long-term solutions for these problems. Having public schools closed “clogs up the whole economy, and it’s a major vulnerability,” he said.

“Until we understand how this is part of our national defense, and fund it appropriately, we’re going to remain extremely vulnerable to these kinds of biological threats.”

What are some things I can do to minimize the risks?

Do as much as you can outdoors. Despite the many photos of people at beaches, even a somewhat crowded beach, especially on a breezy day, is likely to be safer than a pub or an indoor restaurant with recycled air.

But even outdoors, wear a mask if you are likely to be close to others for an extended period.

When indoors, one simple thing people can do is to “open their windows and doors whenever possible,” Marr said. You can also upgrade the filters in your home air-conditioning systems, or adjust the settings to use more outdoor air rather than recirculated air.

Public buildings and businesses may want to invest in air purifiers and ultraviolet lights that can kill the virus. Despite their reputation, elevators may not be a big risk, Milton said, compared with public bathrooms or offices with stagnant air where you may spend a long time.

If none of those things are possible, try to minimize the time you spend in an indoor space, especially without a mask. The longer you spend inside, the greater the dose of virus you might inhale.

Jan 18: To mark the 30th anniversary of the mass exodus of Kashmiri Pandits from the Valley, members of the community took to social media to post videos of themselves by narrating the "Hum Aayenge Apne Watan" dialogue from an upcoming flick, 'Shikara', with the hope that they would return to their homeland one day.

On January 19, 1990, lakhs of Kashmiri Pandits were forced to leave their homes in the Valley following a genocidal campaign launched by the terrorists.

Theatre actor Chandan Sadhu participated in the campaign and said that Kashmiri Pandits have shown "unimaginable resilience" and hope to return to the Valley soon.

"As Kashmiri Pandits complete 30 years in exile this weekend, let our cry for justice be finally noticed. We have shown unimaginable resilience, and today we resolve to return home. Kashmiri Pandit friends: please record this video statement and put it up with #HumWapasAayenge," Sadhu tweeted.

The #HumWapasAayenge is trending on Twitter as more and more Kashmiri Pandits joined in the campaign to narrate the "Hum Aayenge Apne Watan" dialogue and a pledge to return to their homes.

Noted political commentator Sunanda Vashisht tweeted a throwback image of herself and said that resolve to go back home has strengthened more.

"I don't have many pictures left of my childhood. Choosing between life and family albums is really no choice at all. When lives were rescued, family albums got left behind. 30 years have passed. Resolve to go back home has only strengthened. #HumWapasAayenge," she tweeted.

Radio personality Khushboo Mattoo tweeted a video repeating the dialogue from Shikara and tweeted, "Said this in a BBC interview three years back. And I am saying it again #HumWapasAayenge #Shikara."

Journalist Rahul Pandita also took to his Twitter and captioned his post saying, "30 years of exile from Kashmir. Let us now pledge that we will return home."

'Shikara' chronicles the exodus of Kashmiri Pandits from the Valley on the night of January 19, 1990. Helmed by Vidhu Vinod Chopra, the movie is slated to release on February 7.

Netizens have supported the initiative and have expressed solidarity with the Kashmiri Pandits.

In July last year, Home Minister Amit Shah said in the Rajya Sabha that the central government is committed to bringing Kashmiri Pandits and Sufis back to the Valley saying a time will come when they will offer prayers at the famous Kheer Bhawani temple.

"Kashmiri Pandits were forced to leave Kashmir. Many of their shrines were demolished. Sufism was targeted in Jammu and Kashmir. Sufism used to talk about unity and harmony but they were attacked. No voice was raised in favour of Kashmiri Pandits and Sufis when they were brutally attacked. Sufis used to talk about the unity among Hindus and Muslims but they were forced to leave the Valley. Narendra Modi-led government is committed to bringing back Kashmiri Pandits, he had said.

The Mata Kheer Bhawani temple is one of the holiest shrines of Kashmiri Pandits, located about 14 kilometres east of Srinagar.

Last September, a delegation of the Kashmiri Pandit community met the Prime Minister in Houston and thanked him for the historic decision to abrogate Article 370 that gave special status to Jammu and Kashmir.

Modi acknowledged the hardships endured by the community following their exodus from their ancestral homeland back in 1989-1990 due to militancy.

"You have suffered a lot, but the world is changing. We have to move ahead together and build a new Kashmir," the Prime Minister had told the delegation.

"I had a special interaction with Kashmiri Pandits in Houston," Modi had tweeted following the interaction.

In October, Union Minister Prakash Javadekar announced that the Centre has decided to provide compensation of Rs 5.5 lakh each to 5,300 displaced families from Pakistan-occupied Kashmir (PoK), who initially opted to move outside Jammu and Kashmir but later on returned.

These families were earlier left out in the rehabilitation package that was approved by the Cabinet on November 30, 2016.

The Prime Minister had announced a reconstruction plan for Jammu and Kashmir in November 2016. His plan included a rehabilitation package for a one-time settlement of 36,384 displaced persons' (DPs) families of PoK-1947 and Chhamb.