Moves by the administration of U.S. President Donald Trump to slash nearly all U.S. foreign aid has left dozens of water and sanitation projects half-finished across the globe, creating new hazards for some of the people they were designed to benefit.

Sources familiar with infrastructure plans identified 21 unfinished projects in 16 countries. Most of these projects have not previously been reported. With hundreds of millions of dollars in funding canceled since January, workers have put down their shovels and left holes half dug and building supplies unguarded, according to interviews with U.S. and local officials and internal documents.

As a result, millions of people who were promised clean drinking water and reliable sanitation facilities by the United States have been left to fend for themselves. Water towers intended to serve schools and health clinics in Mali have been abandoned, according to two U.S. officials who spoke on condition of anonymity.