DAMASCUS http://www.pharrellwilliamshu.com/adidas-futurecraft-4d.html , Sept. 21 (Xinhua) -- The U.S.-backed Syrian Democratic Forces (SDF) are mopping up the last Islamic State (IS) holdouts in Syria's northern city of Raqqa, the de facto capital of the terror-designated group, a monitor group reported Thursday.

The Syrian Observatory for Human Rights said the IS has lost its main stronghold in Syria by losing Raqqa to the Kurdish-led SDF, adding that the remaining IS fighters are hiding in basements and underground shelters in the city center.

The anticipated victory comes following a 108-day battle by the SDF and allied fighters to drive out IS from Raqqa, which the terror-designated group self-declared as its capital in 2014.