Photo taken on April 7, 2020 shows the empty Al Sabeen park, which is closed to prevent the spread of the COVID-19, in Sanaa, Yemen. (Photo by Mohammed Mohammed/Xinhua)

Photo taken on April 7, 2020 shows the empty Al Sabeen park, which is closed to prevent the spread of the COVID-19, in Sanaa, Yemen. (Photo by Mohammed Mohammed/Xinhua)

Photo taken on April 7, 2020 shows the empty Al Sabeen park, which is closed to prevent the spread of the COVID-19, in Sanaa, Yemen. (Photo by Mohammed Mohammed/Xinhua)

Photo taken on April 7, 2020 shows the empty Al Sabeen park, which is closed to prevent the spread of the COVID-19, in Sanaa, Yemen. (Photo by Mohammed Mohammed/Xinhua)

Photo taken on April 7, 2020 shows the empty Al Sabeen park, which is closed to prevent the spread of the COVID-19, in Sanaa, Yemen. (Photo by Mohammed Mohammed/Xinhua)

Photo taken on April 7, 2020 shows the empty Al Sabeen park, which is closed to prevent the spread of the COVID-19, in Sanaa, Yemen. (Photo by Mohammed Mohammed/Xinhua)

Photo taken on April 7, 2020 shows the empty Al Sabeen park, which is closed to prevent the spread of the COVID-19, in Sanaa, Yemen. (Photo by Mohammed Mohammed/Xinhua)

A worker cleans the Al Sabeen park which is closed to prevent the spread of the COVID-19, in Sanaa, Yemen, April 7, 2020. (Photo by Mohammed Mohammed/Xinhua)

A guard locks the main gate of the Al Sabeen park which is closed to prevent the spread of the COVID-19, in Sanaa, Yemen, April 7, 2020. (Photo by Mohammed Mohammed/Xinhua)