The UK says a new variant of Covid-19 has been identified which may spread more quickly than other strains of the virus.
It comes as London is placed into the highest Tier 3 restrictions from Wednesday because of spiking cases in the British capital.
Pubs and restaurants will have to close in the city, except for takeaway.
UK correspondent Olly Barratt says the variant is now being studied by British scientists to assess its potential impact.
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