Hong Kong: Hong Kong authorities on Sunday barred residents of China's Hubei province from entering the city in response to mounting pressure to enact preventative measures to contain the spreading epidemic.
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Earlier, a group of protesters set alight the lobby of a new residential building that authorities planned to use as a quarantine coronavirus facility.
Witnesses saw several masked protesters run into the public housing block in the Fanling district near to the border with China and light a Molotov cocktail. Black smoke could be seen pouring out of the building.
Firefighters extinguished the fire and the damage appeared to be confined to the lobby area. Hundreds of riot police also moved in, arresting at least one person.
As fears about the virus outbreak intensify, calls have grown for Hong Kong's government to close the financial hub's border with mainland China to minimise the risk of infection.
Earlier on Sunday, hundreds of Hong Kong citizens had blocked roads leading to the building with bricks and other debris, to protest plans to convert the building into a quarantine zone as the number of confirmed cases in the city climbed to six.
"We are dissatisfied with the government selecting this housing estate as a [quarantine] separation village as it's very close to a residential area and a primary school," said a 28-year-old resident surnamed Tsang.
Hong Kong authorities had said they would convert "Fai Ming Estate, an unoccupied public estate in Fanling, into temporary flats for quarantine and observation of close contact persons without symptoms if needed."
Following the protest, the government said it would "cease the related preparation work in Fai Ming Estate."
Hong Kong has been engulfed by demonstrations over the last seven months centred on Hong Kong's relationship with mainland China. with protesters railing against what they see as growing interference from Beijing. Beijing denies meddling and blames the West for stirring trouble in the former British colony.
Hong Kong authorities have so far refused to categorically block the flow of visitors from mainland China across several land border crossings. Direct train and flight connections to and from Wuhan have been suspended.
Health authorities in the afternoon said 107 people were under quarantine, and there were 77 suspected cases.
The ability of the new coronavirus to spread is strengthening and infections could continue to rise, China's National Health Commission said on Sunday.