Yemen

Observers offer three key reasons why the world isn't paying heed to what a UNICEF official calls a "living hell for its citizens and their children"

Top Trump administration officials said they're seeking a halt to hostilities in the war-torn country — and that they'd like to see it within 30 days, to open the door for more permanent peace talks.

The looming catastrophe is "much bigger than anything any professional in this field has seen during their working lives," says the United Nations' humanitarian chief.

The Saudi-led coalition has bombed markets, weddings and even a bus carrying kids during its three year campaign against Shiite Houthi rebels. The U.S. supports the coalition.

The United Nations says 22 children were killed in an airstrike and puts the blame on the Saudi-led forces intervening in the civil war.

The children were on a field trip when the airstrike hit their bus in Saada province, aid groups say. The coalition, which is backed by the U.S., says the strike was a "legitimate military action."

The move, which gives another 18 months of protection from deportation, comes after the Department of Homeland Security declined to do so for nationals from several other countries in the past year.

It's a timely question in the wake of attacks on civilians, aid workers and hospitals. Here's a guide to their history and their content.