Fleeing Iraqi civilians walk past the heavily damaged al-Nuri mosque as Iraqi forces continue their advance against Islamic State militants in the Old City of Mosul, Iraq, Tuesday, July 4, 2017. Islamic State militants managed to launch a counterattack Friday that reversed days of Iraqi army territorial gains in just a matter of hours - a setback that underscores the fragility of the Iraqi security forces despite years of U.S.-led coalition training as well as the instability likely to follow the city's liberation. (AP Photo/Felipe Dana)