People walk on the main shopping street, the Avenue Nouvelle, in Brussels, Belgium, May 11, 2020. Belgium entered phase 1B of the COVID-19 deconfinement on Monday, with businesses throughout the country allowed to reopen under strict conditions. (Xinhua/Zheng Huansong)

A staff member offers pedestrians hand sanitizer on the main shopping street, the Avenue Nouvelle, in Brussels, Belgium, May 11, 2020. Belgium entered phase 1B of the COVID-19 deconfinement on Monday, with businesses throughout the country allowed to reopen under strict conditions. (Xinhua/Zheng Huansong)

A man wearing a face mask walks past a reopened hat shop in Brussels, Belgium, May 11, 2020. Belgium entered phase 1B of the COVID-19 deconfinement on Monday, with businesses throughout the country allowed to reopen under strict conditions. (Xinhua/Zhang Cheng)

A staff member of a shop welcomes customer at the main shopping street, the Avenue Nouvelle, in Brussels, Belgium, May 11, 2020. Belgium entered phase 1B of the COVID-19 deconfinement on Monday, with businesses throughout the country allowed to reopen under strict conditions. (Xinhua/Zheng Huansong)

People queue outside a shop at the main shopping street, the Avenue Nouvelle, in Brussels, Belgium, May 11, 2020. Belgium entered phase 1B of the COVID-19 deconfinement on Monday, with businesses throughout the country allowed to reopen under strict conditions. (Xinhua/Zheng Huansong)

A policeman stands to keep the traffic in order at the main shopping street, the Avenue Nouvelle, in Brussels, Belgium, May 11, 2020. Belgium entered phase 1B of the COVID-19 deconfinement on Monday, with businesses throughout the country allowed to reopen under strict conditions. (Xinhua/Zheng Huansong)

People queue to enter a reopened clothing store in Brussels, Belgium, May 11, 2020. Belgium entered phase 1B of the COVID-19 deconfinement on Monday, with businesses throughout the country allowed to reopen under strict conditions. (Xinhua/Zhang Cheng)

A woman wearing a face mask walks past a reopened clothing store in Brussels, Belgium, May 11, 2020. Belgium entered phase 1B of the COVID-19 deconfinement on Monday, with businesses throughout the country allowed to reopen under strict conditions. (Xinhua/Zhang Cheng)

Photo taken on May 11, 2020 shows a billboard reminding people of keeping distance at the door of a clothing store in Brussels, Belgium. Belgium entered phase 1B of the COVID-19 deconfinement on Monday, with businesses throughout the country allowed to reopen under strict conditions. (Xinhua/Zhang Cheng)