German Chancellor Angela Merkel puts on a face mask after a news conference on further coronavirus measures, at the Chancellery in Berlin, Germany, Jan. 19, 2021.

Video. COVID-19: Germany tightens lockdown as Netherlands sets curfew

"The number of new infections has decreased. That gives us hope. But the virus mutation carries a great danger. Now is the time to prevent this danger," Chancellor Merkel said as she announced the new measures.

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