Hong Kong has begun a mandatory two-week quarantine for anyone arriving from mainland China, in a fresh effort to contain the deadly new coronavirus.
Visitors must isolate themselves in hotel rooms or go to government-run centres, while returning Hong Kong residents must stay inside their homes.
Anyone caught flouting the new rules faces a fine and a prison sentence.
Tens of thousands of travellers queued at the Chinese border city of Shenzhen to beat the Friday midnight deadline.
But by Saturday morning only a trickle of people were arriving via the Shenzhen Bay Port crossing.
Hong Kong has seen 26 confirmed cases of the virus and one person has died. The number of confirmed cases in mainland China stands at 34,546, with 722 deaths.
Outside China, 270 cases have been confirmed in at least 25 countries, with one other fatality – in the Philippines.