Fatma Tanis

It is the world's largest displacement crisis: 13 million people have fled their homes in war-torn Sudan. In neighboring Chad, both refugees and locals cope with this extraordinary upheaval.

The refugees escaping the civil war in Sudan recount the violence which took the lives of many men and boys. That violence, they say, was directed towards those of particular tribes and skin colors.

Hundreds of thousands of Sudanese refugees have fled to Chad, where they're facing increasingly difficult conditions as their presence strains local resources and humanitarian aid organizations.

A team of independent famine experts, working under the U.N. umbrella, believe Sudan is experiencing famine. But issuing a declaration — which could bring in more aid — turns out to be complicated.

The government of Sudan has not made an official declaration of famine and denies that famine exists. Aid groups are concerned that without a declaration, international resources won't be mobilized.

The virus has been confined to certain areas of the Amazon but is moving into new turf as climate change enables the insects that spread it to spread out. Here's what we know.

An emergency coordinator from Doctors Without Borders has seen crises around the world but says she's never seen anything like this. A new report from the aid group underscores her assessment.

Health-care facilities have been under attack by both sides in Sudan’s year-long civil war. Aid groups are trying to shore up care with mobile clinics but fear the need is too great.

A year ago, she packed what she could, helped her mother, who's in a wheelchair, into the car and drove all night to find a haven. In the U.S. to accept an award, she talks about her country's crisis.

The Norwegian Refugee Council and UN say global migration has reached highest levels ever. One reason has to do with the way wars have changed as combatants increasingly target civilians directly.