Iraqis gather water in a neighborhood in central Fallujah, Iraq as Iraqi counterterrorism forces battle Islamic State militants on the southern edge of the city on Tuesday, May 31, 2016. A leading aid group raised alarm over the unfolding “human catastrophe” here, where an estimated 50,000 people remain trapped as the fight intensifies and renewed calls on warring parties to open up safe corridors for civilians to flee.(AP Photo)

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