Beijing has ordered everyone returning to the city to go into quarantine for 14 days or risk punishment in the latest attempt to contain the deadly new coronavirus, state media report.
Residents were told to "self-quarantine or go to designated venues to quarantine" after returning to the Chinese capital from holidays.
The measure came as Egypt confirmed the first coronavirus case in Africa.
Over 1,500 people have died from the virus, which originated in Wuhan city.
The notice on Friday from Beijing's virus prevention working group was issued as residents returned from spending the Lunar New Year in other parts of China.
The holiday was extended this year to help contain the outbreak.
More than 20 million people live in Beijing.
A World Health Organization (WHO)-led mission to China will start its outbreak investigation work this weekend, focusing on how the virus - officially named Covid-19 - is spreading and its severity, director Tedros Adhanom Ghebreyesus said.
The mission, including international experts, will also look at how and when more than 1,700 health workers contracted the virus.
The team consists of 12 international members and their 12 Chinese counterparts.
"Particular attention will be paid to understanding transmission of the virus, the severity of disease and the impact of ongoing response measures," said Dr Mike Ryan, executive director of the WHO health emergencies programme.