Yemenis take their breakfast at a restaurant in the Old City of Sanaa, Yemen, Sept. 19, 2019. (Photo:Xinhua)

Men walk in the Old City of Sanaa, Yemen, Sept. 19, 2019.

People ride a motorcycle in the Old City of Sanaa, Yemen, Sept. 19, 2019.

A roadside vendor prepares his goods as he waits for customers at a market in the Old City of Sanaa, Yemen, Sept. 19, 2019.