It's the third time this month that that the US has downed aircraft affiliated with Syrian President Bashar Assad’s government.
Devastating conflicts, violence and persecution in places like Syria and South Sudan had left a record 65.6 million people uprooted from their homes by the end of 2016.
Uncertainty and confusion surrounded the fate of the head of the Islamic State group Friday as Russia announced it may have killed him in an airstrike.
Doha has long faced accusations that it is a state sponsor of terror.
A suspected cholera outbreak is spreading quickly in war-ravaged Yemen, with an estimated 3,000 to 5,000 new cases every day.
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