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Dr. Taher has come under attack three times while treating patients in Syria.

"Nightline" reports from war-torn Yemen, where three years of conflict have left nearly three million people homeless and 22 million in need of humanitarian aid. The story shows ̽»¨¾«Ñ¡ teams reaching remote villages to provide lifesaving aid. Watch part 2 of the report.  

Idlib is the only part of Syria still controlled by opposition groups after seven years of war. Many people here have fled other areas of the country and are now living in desperate conditions. If the fighting starts again, they could face the worst humanitarian crisis of the conflict. Watch and share.