Syria's civil war – in pictures

A Free Syrian Army fighter prepares to fire an RPG as a Syrian army tank shell hits a building across a street during heavy fighting in central Aleppo Photograph: Goran Tomasevic/Reuters

A Free Syrian Army fighter drags a dead man shot in Salaheddine neighborhood in Aleppo out of the line of sniper fire Photograph: Goran Tomasevic/Reuters

A fighter mans a makeshift barricade in Aleppo Photograph: Goran Tomasevic/Reuters

A woman is being escorted to safety from an exposed street during clashes in Aleppo Photograph: Goran Tomasevic/Reuters

A Free Syrian Army fighter reacts after hearing that his commander has been killed by a tank shell Photograph: Goran Tomasevic/Reuters

A fighter takes aim with his sniper rifle ... Photograph: Goran Tomasevic/Reuters

... while another runs for cover during heavy fighting in central Aleppo Photograph: Goran Tomasevic/Reuters

Free Syrian Army fighters take cover behind sand bags in Aleppo Photograph: Goran Tomasevic/Reuters

Father and mother cry over the body of their son killed by a sniper in Aleppo Photograph: Goran Tomasevic/Reuters

Fighters climb over a wall during heavy fighting in Salaheddine neighbourhood of central Aleppo Photograph: Goran Tomasevic/Reuters

A Free Syrian Army fighter fires an AK-47 rifle during street fighting in Aleppo Photograph: Goran Tomasevic/Reuters

A man carries the body of a boy killed in a Syrian Air Force air strike in Azaz Photograph: Goran Tomasevic/Reuters

A man cries in front of houses destroyed in the air raid Photograph: Goran Tomasevic/Reuters

A man searches for bodies in the rubble following a Syrian Air Force air strike in Azaz Photograph: Goran Tomasevic/Reuters

A man stands on top of houses destroyed in an air raid in Azaz Photograph: Goran Tomasevic/Reuters

A Free Syrian Army fighter fires from his sniper rifle from a house in Aleppo Photograph: Goran Tomasevic/Reuters