People are seen at a park in Brussels, Belgium, March 24, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Xinhua/Zheng Huansong)

The empty square is seen near the European Union headquarters in Brussels, Belgium, March 22, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Photo by Riccardo Pareggiani/Xinhua)

A letter to thank the pharmacists is seen on a window of a shop in Brussels, Belgium, March 24, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Photo by Riccardo Pareggiani/Xinhua)

A closed restaurant is seen near the European Commission building in Brussels, Belgium, March 21, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Photo by Riccardo Pareggiani/Xinhua)

The street is seen near the European Commission building in Brussels, Belgium, March 21, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Photo by Riccardo Pareggiani/Xinhua)

A lady wearing a mask waits for a bus in Brussels, Belgium, March 20, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Photo by Riccardo Pareggiani/Xinhua)

A mail man wearing a mask delivers a package in Brussels, Belgium, March 20, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Photo by Riccardo Pareggiani/Xinhua)

Police officers instruct people not to gather at a park in Brussels, Belgium, March 24, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Xinhua/Zheng Huansong)

People walk on a street in Brussels, Belgium, March 24, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Xinhua/Zheng Huansong)

A couple sprays hygienic liquid to clean the hands in Brussels, Belgium, March 20, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Photo by Riccardo Pareggiani/Xinhua)

A notice on prevention of the coronavirus is seen at the gate of the Cinquantenaire park in Brussels, Belgium, March 22, 2020. The cases of COVID-19 confirmed in Europe exceeded 200,000 as of Tuesday evening. The hardest hit countries remained to be Italy, Spain, Germany and France, with over 150,000 cases in combination. (Photo by Riccardo Pareggiani/Xinhua)