The WHO, which last month declared Sars a global emergency, has tracked the spread of the disease through air travel.
Beijing is the hardest hit place in China, where Sars is believed to have originated. China has the world's highest death toll from the virus with 106 fatalities.
Authorities there announced the closure of all the capital's schools for two weeks in an attempt to stop Sars from spreading to 1.7 million schoolchildren.
Officials have already said they would quarantine hotels, hospitals or other buildings suspected of infection and would take "compulsory measures" against anyone not co-operating.
Hong Kong, which also reported more deaths and infections, announced a £1bn package to help businesses reeling from the impact of the disease. The city has now had 105 Sars deaths.
Police in Australia have been given new powers to round up and quarantine suspected Sars victims.
In Singapore, where there have been 189 infections and up to 17 deaths, alarm was growing over an outbreak among vendors at its largest vegetable market.


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