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People wearing face masks walk in the Champ de Mars in Paris, France, on March 19, 2021. French Prime Minister Jean Castex on Thursday announced "new massive measures" to curb COVID-19 in the country's 16 worst-hit regions, including Paris. Starting Friday midnight, about 18 million French people in regions such as Paris, Hauts-de-France in the north as well as the Alpes-Maritimes on the Mediterranean should stay at home, Castex announced at a press briefing on the epidemic situation. (Xinhua/Gao Jing)