From Aljazeera:

Al-Qaeda fighters have struck a bloody blow in scenes of medieval violence in Syria’s northern border-town of Jarabulus. Fighting came to a head on January 17, between rebel groups Liwa al-Tawhid Brigade and the al-Qaeda-linked Islamic State of Iraq and the Levant (ISIL) in the town, when reinforcements arrived from Raqqa and reclaimed the city in a brutal four-hour battle.