A Saudi-led coalition fighting Yemeni rebels eased an air, land, and sea blockade of Yemen a week ago, but it is still keeping commercial ships with food and fuel from docking and unloading their cargo in the country, putting millions at risk of starving, the United Nations said this weekend.

Millions of Yemenis depend on those supplies, and without fuel, health and water facilities can’t run. So Yemen’s cities are running out of clean water, the chiefs of several United Nations agencies and other top humanitarian officials said in a statement Saturday.

“Urban water networks in seven cities have run out of fuel and now depend on humanitarian organizations to fill in the gap,” the officials said. “Other cities will shortly be in a similar situation if the blockade is not lifted, which would leave 11 million people without safe water.”