MOSUL, IRAQ - JULY 8: Iraqi Special Operation Forces (ISOF) soldiers in the Islamic State occupied Old City district where heavy fighting continues on July 8, 2017 in Mosul, Iraq. Iraqi forces continue to encounter stiff resistance from Islamic State with improvised explosive devices (IED's), suicide bombers, heavy mortar fire, gas attacks and snipers hampering their advance. (Photo by Martyn Aim/Corbis via Getty Images)
