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 government-run centres. Residents must stay inside their homes.
Anyone caught flouting the new rules faces a fine and a prison sentence.
Meanwhile, 722 deaths were recorded in mainland China, including one American. A Japanese man also died with symptoms consistent with the virus.
The 60-year-old US citizen, the first confirmed non-Chinese victim of the illness, died on Thursday at Jinyintan Hospital in Wuhan, the epicentre of the outbreak, according to a US embassy spokesman in Beijing, who did not give details.
Separately, the Japanese foreign ministry said a man in his 60s died, also in Wuhan, from what was suspected to be a case of coronavirus. However, it said it could not confirm the diagnosis, and that Chinese officials said the cause of death was viral pneumonia.
The city is opening its second makeshift hospital since the outbreak began. Leishenshan hospital was built in two weeks and will be able to accommodate 1,500 patients.