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Fighters from rebel factions and Jaish al-Islam (Islam Army), the foremost rebel group in Damascus province who fiercely oppose to both the regime and the Islamic State group, prepare their ammunition in Harasta Qantara, near Marj al-Sultan on the eastern outskirts of Damascus, on January 23, 2016, during clashes with government forces after they infiltrated into the government-held area. / AFP / AMER ALMOHIBANY (Photo credit should read AMER ALMOHIBANY/AFP/Getty Images)

Fighters from rebel factions and Jaish al-Islam (Islam Army), the foremost rebel group in Damascus province who fiercely oppose to both the regime and the Islamic State group, prepare their ammunition in Harasta Qantara, near Marj al-Sultan on the eastern outskirts of Damascus, on January 23, 2016, during clashes with government forces after they infiltrated into the government-held area.   / AFP / AMER ALMOHIBANY        (Photo credit should read AMER ALMOHIBANY/AFP/Getty Images)