The Latest on the outbreak of the new coronavirus in China (all times local):

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A militia member uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

The Latest on the outbreak of the new coronavirus in China (all times local):

A militia member uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

The ministry said late Thursday the man arrived in Singapore with his family on Jan. 20. It said the man is now in isolation in a hospital in the Southeast Asian city-state.

A policeman uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

3 a.m.

A policeman uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Normally bustling streets, shopping malls, restaurants and other public spaces in the city of 11 million people were eerily quiet. In addition to the train station, airport, ferry, subway and bus services were also halted.

Barricades block access to the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Barricades block access to the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Chinese paramilitary police stand guard outside the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Chinese paramilitary police stand guard outside the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Police stand near a billboard announcing the closure Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Police stand near a billboard announcing the closure Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

A worker hoses down benches outside the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

A worker hoses down benches outside the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

2 p.m.

Singapore’s Ministry of Health says the country has confirmed its first case of the new coronavirus, a 66-year-old Chinese national from Wuhan.

A militia member uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

A militia member uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

The ministry said late Thursday the man arrived in Singapore with his family on Jan. 20. It said the man is now in isolation in a hospital in the Southeast Asian city-state.

The statement said health officials are also investigating another suspected case, after a preliminary test for the virus was positive. That person is a 53-year-old woman from Wuhan.

China, meanwhile, has decided to lock down three cities including Wuhan that are home to more than 18 million people in an unprecedented effort to try to contain the deadly new viral illness that has sickened hundreds.

A militia member uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

A militia member uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

3 a.m.

China has decided to lock down three cities that are home to more than 18 million people in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries in the Lunar New Year travel rush.

Police, SWAT teams and paramilitary troops guarded Wuhan's train station, where metal barriers blocked the entrances at 10 a.m. sharp. Only travelers holding tickets for the last trains were allowed to enter, with those booked for later trains being turned away.

A policeman uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

A policeman uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Normally bustling streets, shopping malls, restaurants and other public spaces in the city of 11 million people were eerily quiet. In addition to the train station, airport, ferry, subway and bus services were also halted.

Similar measures will take effect from Friday in the nearby cities of Huanggang and Ezhou.

In the capital Beijing, authorities canceled “major events" indefinitely, including traditional temple fairs that are a staple of Lunar New Year holiday celebrations,

A policeman uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

A policeman uses a digital thermometer to take a driver's temperature at a checkpoint at a highway toll gate in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Barricades block access to the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Barricades block access to the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Chinese paramilitary police stand guard outside the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Chinese paramilitary police stand guard outside the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Police stand near a billboard announcing the closure Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

Police stand near a billboard announcing the closure Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

A worker hoses down benches outside the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)

A worker hoses down benches outside the closed Hankou Railway Station in Wuhan in central China's Hubei Province, Thursday, Jan. 23, 2020. China closed off a city of more than 11 million people Thursday in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries amid the Lunar New Year travel rush. (Chinatopix via AP)