AP APTOPIX Mideast Yemen

A boy carries buckets to fill with water from a public tap amid an acute shortage of water, on the outskirts of Sanaa, Yemen, Tuesday, Oct. 13, 2015. The war has taken a heavy toll on Yemen. More than 4,000 people have been killed, and the humanitarian crisis has left the impoverished country on the brink of famine. (AP Photo/Hani Mohammed)

A boy carries buckets to fill with water from a public tap amid an acute shortage of water, on the outskirts of Sanaa, Yemen, Tuesday, Oct. 13, 2015. The war has taken a heavy toll on Yemen. More than 4,000 people have been killed, and the humanitarian crisis has left the impoverished country on the brink of famine. (AP Photo/Hani Mohammed)