'Ali had been travelling through Syria in a bid to cross the Turkish border when he was caught by IS at Deir al-Zour. The teenager's death sparked protests in his home town of Jasim, which Alkhalef said prompted the distribution of leaflets warning residents that IS would take over the area.
"They [residents] said, 'It's not fair, a child of 17 was killed with no crime,'" said Alkhalef, through a translator. "It really confirmed to people that IS was criminal. In the flyers it said: 'We're going to rule Daraa, we're going to overcome, and we're going to apply Sharia law - Islamic Law - on you."
She said the Free Syrian Army, which was set up by officers and soldiers who defected from the Syrian Armed Forces during the country's civil war, gathered the leaflets and asked people to hand them in.
Alkhalef believes IS fighters tried to shoot her eldest brother in March. She said clashes between IS and the Free Syrian Army also took place in April.
"The reason we know it's Daesh is as the Free Syrian Army caught the men who tried to shoot my brother," said Alkhalef.'