Yemenis receive food from a food distribution center in Sanaa, Yemen, on Sept. 25, 2018. (Photos: Xinhua)

Yemeni children line up to receive food from a food distribution center in Sanaa, Yemen, on Sept. 25, 2018.

Some 18 million of the 29 million Yemenis, including a high proportion of children, are food insecure, said UN Undersecretary-General for Humanitarian Affairs Mark Lowcock on Sept. 21.