Hong Kong's hospital system could face "collapse" as it grapples with a sharp rise in coronavirus cases, the city's leader Carrie Lam has warned.
She said the city was "on the verge of a large-scale community outbreak", urging people to stay indoors.
New regulations, including mandatory face masks and the closure of dine-in restaurants, kicked in on Wednesday.
Hong Kong – which had early success against Covid-19 – is now regularly reporting over 100 new daily cases.
Less than a month ago, the average number of new daily cases was under 10.
What did Carrie Lam say?
In a statement late on Tuesday, Ms Lam warned the city was on the "verge of a large-scale community outbreak, which may lead to a collapse of our hospital system and cost lives, especially of the elderly".
She called on residents to adhere "strictly to social distancing measures and stay at home as far as possible".
Her remarks come as Hong Kong confirmed another 106 coronavirus cases on Tuesday, and reported its 23rd overall death.
A record 145 cases were recorded on Monday.
What are the new restrictions?
From Wednesday, dining in restaurants is banned, and only two people from different households can meet, under the toughest rules Hong Kong has adopted so far.
It's also now compulsory for face masks to be worn in all public places.
It was earlier announced that spaces like bars, gyms and beauty parlours would be closed.
At the start of the month, public gatherings of up to 50 people were allowed – but that was reduced to four, and now two.
Wasn't Hong Kong a virus success story?
It definitely looked that way to begin with.
At the start of the outbreak earlier this year, cross-border travel with China was sharply reduced, "track and trace" was introduced, and other restrictions were imposed.
The city went weeks without a locally transmitted case.
But as life started to go back to normal, a rise in locally transmitted cases was recorded. The average number of new cases rose from single figures at the start of the month, to more than 120 now.
One professor at the University of Hong Kong said the cases had probably emerged due to "flaws in border procedures in Hong Kong".
Jin Dongyan told the Global Times that "patients from overseas may have brought the virus to communities which resulted in the current local transmission".
The latest person to die from the virus was a resident of a care home where at least 45 infections have been recorded.
Local scientists have voiced fears that a strain of the virus circulating in Hong Kong could cause greater damage.
It is said to have not mutated for at least 22 days, meaning it could have adapted well to humans, becoming easier to transmit.
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