Prime Minister Mette Frederiksen announced special restrictions for more than 280,000 people in the north of Denmark on Thursday after a mutated version of the new coronavirus linked to mink farms was found in humans.
Copenhagen warned that the mutation could threaten the effectiveness of any future vaccine.
“From tonight, citizens in seven areas of North Jutland are strongly encouraged to stay in their area to prevent the spread of infection,” Frederiksen told a news conference, adding that people were being ordered not to travel there, while bars and restaurants would also shut.
“We are asking you in North Jutland to do something completely extraordinary,” Frederiksen said, talking of a “real closure” of the region.
“The eyes of the world are on us,” she added.