US
More than 100 people were evacuated from the hotel following the incident
The outgoing government toughened measures, including a ban on Christmas markets
Restrictions on air travel from South Africa took effect on Sunday
A traveller who returned from South Africa last week tested positive for virus
WHO declared Omicron as ‘variant of concern’
China could face more than 630,000 infections a day if it dropped its zero-tolerance policies, say mathematicians
Prime Minister Boris Johnson says face masks will again be required in shops and on public transport
The variant is potentially more contagious than previous variants of the disease
The government says excellent science should be applauded and not punished
The countries include South Africa, Botswana, Zimbabwe, Namibia, Lesotho and Eswatini, Colombo