Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Rebel groups battling the Islamic State in Syria have proudly paraded the severed heads of their defeated enemies, in the latest sign that all sides in the conflict are resorting to shocking barbarism. A coalition of anti-Assad forces were stationed in the town of Azaz, close to the Turkish border, when ISIS militants prepared to carry out a suicide bomb attack followed by a massive assault. But the rebels were tipped off about the attack in advance and were prepared for the jihadis when they arrived - slaughtering them in the streets of the Azaz before posing with the extremists' severed heads and displaying their mutilated corpses in the centre of the city.Local fighters were tipped off about an ISIS assault on the town of AzazThey ambushed ISIS militants before they could launch a deadly attackRebels then beheaded several ISIS fighters in front of cheering crowdsDisplayed the militants' mutilated corpses in a square in the centre of town 
 Question:ISIS captured Suran a week ago and has been fighting an alliance of rebels including Al-Nusra and Islamist _-Sham in the surrounding area.

Azaz