A major Islamic State group counterattack Friday, July 7 along the northern edge of Mosul’s Old City neighborhood has pushed Iraqi Army forces back some 75 meters (82 yards) and is threatening recent gains in other Old City fronts, an Iraqi military officer said, according to The Associated Press.

The officer said the attack was launched just after noon Friday and estimated it was carried out by 50 to 100 IS fighters. A doctor at a medic station said he received more than a dozen wounded Iraqi soldiers.

Both men spoke on condition of anonymity in line with regulations.

Iraqi security forces have retaken almost all of Mosul — Iraq’s second largest city — from IS militants who overran it in 2014.

In late June, IS counterattacks on the western edge of Mosul — neighborhoods retaken months earlier — stalled the push by Iraqi forces to go deeper into the Old City as they forced a reallocation of Iraqi ground forces, coalition surveillance and air support.

Unlike the Friday attack, the late June counterattack was launched from outside Mosul, most likely from Tal Afar, an IS-held town some 60 kilometers (37 miles) west of Mosul.

The counterattacks underscore the extremist group’s resilience in Iraq, despite significant territorial losses and months of heavy fighting with Iraqi forces backed by U.S. air power.

The pockets of IS-held Mosul now measure less than a square kilometer.