Syrian civil war: Rebel group clashes with President Bashar al-Assad's government forces

Many of the fighters entrenched in the Damascus are originally from the area and move around using an elaborate network of underground tunnels, giving them an advantage against President Assad's forces.

A fighter with the Army of Islam rebel group, as he prepares a rocket propelled grenade in the suburbs of the Syrian capital Damascus. | AP 

Rebel fighters with Failaq al-Rahman, firing their weapons during clashes with government forces in the suburbs of the Syrian capital Damascus. | AP

A fighter with the Army of Islam rebel group firing artillery during clashes with government forces in the southern province of Daraa, Syria. | AP

A fighter with the Army of Islam, as he loads a heavy machine gun with bullets, in the suburbs of the Syrian capital Damascus. | AP

Fighters from Ahrar al-Sham during a battle against Syrian government forces, in Ghouta, an eastern neighborhood of Damascus, Syria. | AP

Fighters with Failaq al-Rahman firing their weapons during clashes with government forces in the suburbs of the Syrian capital Damascus. | AP

An injured man sitting inside a Civil Defense van after airstrikes hit near Ghouta, a rebel-held suburb near Damascus, Syria. | AP

injured people inside a Civil Defense van after airstrikes hit near Ghouta, a rebel-held suburb near Damascus, Syria. | AP