Cafe workers serve customers inside a cafe in Sanaa, Yemen, April 2, 2020. (Photo by Mohammed Mohammed/Xinhua)

A vendor waits for customers at a market in Sanaa, Yemen, April 2, 2020. (Photo by Mohammed Mohammed/Xinhua)

A man sells masks at a market in Sanaa, Yemen, April 2, 2020. (Photo by Mohammed Mohammed/Xinhua)