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MOSUL, IRAQ - JULY 7: The body of an Islamic State militant in the Old City district where heavy fighting continues on July 7, 2017 in Mosul, Iraq. Islamic State militants are increasingly desperate and there has been a dramatic increase in suicide attacks targeting both fleeing civilians and Iraqi forces. (Photo by Martyn Aim/Corbis via Getty Images)

MOSUL, IRAQ - JULY 7: The body of an Islamic State militant in the Old City district where heavy fighting continues on July 7, 2017 in Mosul, Iraq. Islamic State militants are increasingly desperate and there has been a dramatic increase in suicide attacks targeting both fleeing civilians and Iraqi forces. (Photo by Martyn Aim/Corbis via Getty Images)