South Korea has stepped up measures to contain the spread of the deadly new coronavirus, as confirmed infections increased sharply for a second day.
PM Chung Sye-kyun said it was now an emergency as 100 new cases and the country’s second death were confirmed.
The southern cities of Daegu and Cheongdo have been declared “special care zones”. The streets of Daegu are now largely abandoned.
All military bases are in lockdown after three soldiers tested positive.
About 9,000 members of a religious group were told to self quarantine, after the sect was identified as a coronavirus hotbed.
The authorities suspect the current outbreak in South Korea originated in Cheongdo, pointing out that a large number of sect followers attended a funeral of the founder’s brother from 31 January to 2 February.
On Friday, a second person who contracted the coronavirus died. They were a patient at the same mental hospital in Cheongdo as the country’s first victim.
Another 15 patients have also tested positive.
On Thursday, 53 new cases were reported. South Korea now has a total of 204 cases making it the largest cluster outside mainland China and the cruise ship docked off Japan.
The new virus, which originated last year in Hubei province in China, causes a respiratory disease called Covid-19.
From the 100 new cases reported on Friday, 86 were in Daegu, a city 300km (186 miles) south-east of the capital Seoul, and nearly all of those were from a cluster involving the religious sect.
Reacting to the quickly deteriorating situation, the government promised swift measures to prevent further spread of the virus.
“It is urgent to find people who have contacted infected people and cure patients,” PM Chung said, according to news agency Yonhap.
He said the government was readying resources like sickbeds, medical equipment and health workers and warned the virus was now spreading locally.
“The government has so far focused on curbing infections coming from outside the country. From now on, the government will further prioritise preventing the virus from spreading locally.”
Health Minister Park Neung-hoo said authorities would allow hospitals to isolate respiratory patients from others in an effort to prevent any spread within medical institutions.
He also said that all pneumonia patients in Daegu hospitals would be checked for the virus.
The city’s biggest cluster appears to be at a branch of a religious sect which calls itself the Shincheonji Church of Jesus, Temple of the Tabernacle of the Testimony.
South Korean health officials believe these infections are linked to a 61-year-old woman who tested positive for the virus earlier this week.
The Shincheonji, which has been accused of being a cult, said it had now shut down its Daegu branch and that services in other regions would be held online or individually at home.
As of Friday, more than 400 members of the church were showing symptoms of the disease, though tests were still ongoing, the city mayor said.
Daegu is the country’s fourth-largest city, with a population of 2.5 million people.
Residents are now being asked to remain at home after authorities described the church cluster as “super-spreading event”.
By Hyung Eun Kim, BBC Korean Service, Seoul
Many people in South Korea are wearing masks on a daily basis.
Hand sanitizers have been placed at public transport stops and building entrances.
Warning government signs are everywhere. They say: “Three ways to prevent further infection: wear a mask at all times; wash your hands properly with soap for more than 30 seconds; and cover yourself when coughing.”
Koreans have also developed several apps and websites that tell you how much risk you face where you are. They show where the infected people are within a 10km radius.
“I can’t miss work, what I can do is minimise contact with others and stay at home during the weekend,” Seung-hye Lim, a Seoul resident, told the BBC.
“I do wonder if we reacted too laxly initially or if it really is because of the specific service practices of the Shincheonji sect.”
So-young Sung, a mother of two in Seoul, told the BBC: “It feels like my daily life is collapsing.”
She said she was struggling to find pharmacies that had masks.
She added that checking coronavirus-related alarms from her children’s schools and kindergartens was now a daily routine for her.
The latest figures from China put the death toll from the disease at 2,236 people and total infections at more than 75,000.
The virus has now hit the country’s prison system, with more than 500 inmates confirmed infected.
Senior officials have already been sacked for mishandling management of the outbreak.
The virus has also spread around the globe with more than 1,000 cases and several deaths in the rest of Asia, in Europe, the US and Africa.
South Korea is now the worst affected country after mainland China and the more than 600 infections on a cruise ship docked in Japan.
Passengers of the Diamond Princess who have tested negative continue to disembark the ship in Yokohama after more than 14 days quarantined on board.
More than 150 Australian passengers have been evacuated from the ship and have already arrived in Darwin, where they will begin two more weeks of quarantine.
Australian officials said on Friday that six people had reported feeling unwell on arrival in Darwin and were immediately tested.
Two of those people tested positive despite having received negative tests before leaving Japan.
The first batch of people from Hong Kong have also flown back to the city, where they will similarly be quarantined.
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