Libyan forces have retaken parts of Sirte from ISIS militants, gaining ground in the extremist group’s most significant stronghold outside Syria and Iraq, according to a Libyan military group.

In the ongoing offensive, forces supporting the U.N.-brokered government gained control of a port late Friday after fierce clashes with ISIS militants and are in complete control of the al-Sarawa area east of Sirte, according to Al-Bunyan al-Marsous, a military offensive led by Libyan forces from Misrata.

The offensive that has lasted almost two weeks has left more than a hundred fighters dead and about 400 others wounded, the Government of National Accord said, calling on the international community to provide urgent medical support to Libyan security forces.

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