A man walks during a visit by a U.N. delegation to the Red Sea port of Hodeidah, Yemen July 26, 2017. Image used for illustrative purpose.

Police troopers ride on the back of a patrol truck during a visit by a U.N. delegation to the Red Sea port of Hodeidah, Yemen July 26, 2017. REUTERS/Abduljabbar Zeyad

A convoy carrying a U.N. delegation arrives at the Red Sea port of Hodeidah, Yemen July 26, 2017. REUTERS/Abduljabbar Zeyad

Members of a U.N. delegation ride on a ship ducked at the Red Sea port of Hodeidah, Yemen July 26, 2017. REUTERS/Abduljabbar Zeyad

Members of a U.N. delegation tour the Red Sea port of Hodeidah, Yemen July 26, 2017. REUTERS/Abduljabbar Zeyad

A police trooper stands guard during a visit by a U.N. delegation to the Red Sea port of Hodeidah, Yemen July 26, 2017. Image for illustrative purposes.