Free Syrian Army fighters help an injured comrade at a front line at Aleppo International Airport
Free Syrian Army fighters help an injured comrade at a front line at Aleppo International Airport January 25, 2014. Activists say violent clashes are taking place in the neighborhood of Karam Altarab as forces loyal to Syria's President Bashar al-Assad attempt to secure the perimeter of Aleppo International Airport. REUTERS/Saad Abobrahim (SYRIA - Tags: CIVIL UNREST CONFLICT)
Free Syrian Army fighters help an injured comrade at a front line at Aleppo International Airport
Free Syrian Army fighters help an injured comrade at a front line at Aleppo International Airport January 25, 2014. Activists say violent clashes are taking place in the neighborhood of Karam Altarab as forces loyal to Syria's President Bashar al-Assad attempt to secure the perimeter of Aleppo International Airport. REUTERS/Saad Abobrahim (SYRIA - Tags: CIVIL UNREST CONFLICT)
Free Syrian Army fighters run with their weapons at a front line at Aleppo International Airport
Free Syrian Army fighters run with their weapons at a front line at Aleppo International Airport January 25, 2014. Activists say violent clashes are taking place in the neighborhood of Karam Altarab as forces loyal to Syria's President Bashar al-Assad attempt to secure the perimeter of Aleppo International Airport. REUTERS/Saad Abobrahim (SYRIA - Tags: CIVIL UNREST CONFLICT)
A Free Syrian Army fighter fires his weapon at a front line at Aleppo International Airport
A Free Syrian Army fighter fires his weapon at a front line at Aleppo International Airport January 25, 2014. Activists say violent clashes are taking place in the neighborhood of Karam Altarab as forces loyal to Syria's President Bashar al-Assad attempt to secure the perimeter of Aleppo International Airport. REUTERS/Saad Abobrahim (SYRIA - Tags: CIVIL UNREST CONFLICT)
A Free Syrian Army fighter runs with his weapon at a front line at Aleppo International Airport
A Free Syrian Army fighter runs with his weapon at a front line at Aleppo International Airport January 25, 2014. Activists say violent clashes are taking place in the neighborhood of Karam Altarab as forces loyal to Syria's President Bashar al-Assad attempt to secure the perimeter of Aleppo International Airport. REUTERS/Saad Abobrahim (SYRIA - Tags: CIVIL UNREST CONFLICT)
A Free Syrian Army fighter takes up position at a front line at Aleppo International Airport
A Free Syrian Army fighter takes up position at a front line at Aleppo International Airport January 25, 2014. Activists say violent clashes are taking place in the neighborhood of Karam Altarab as forces loyal to Syria's President Bashar al-Assad attempt to secure the perimeter of Aleppo International Airport. REUTERS/Saad Abobrahim (SYRIA - Tags: CIVIL UNREST CONFLICT)
Free Syrian Army fighters adjust their rifle at a front line at Aleppo International Airport
Free Syrian Army fighters adjust their rifle at a front line at Aleppo International Airport January 25, 2014. Activists say violent clashes are taking place in the neighborhood of Karam Altarab as forces loyal to Syria's President Bashar al-Assad attempt to secure the perimeter of Aleppo International Airport. REUTERS/Saad Abobrahim (SYRIA - Tags: CIVIL UNREST CONFLICT)
Smoke rises between buildings in a residential area beside a front line at Aleppo International Airport
Smoke rises between buildings in a residential area beside a front line at Aleppo International Airport January 25, 2014. Activists say violent clashes are taking place in the neighborhood of Karam Altarab as forces loyal to Syria's President Bashar al-Assad attempt to secure the perimeter of Aleppo International Airport. REUTERS/Saad Abobrahim (SYRIA - Tags: CIVIL UNREST CONFLICT)
A damaged souk is pictured in the besieged area of Homs
A damaged souk is pictured in the besieged area of Homs January 25, 2014. REUTERS/Thaer Al Khalidiya (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Man walk through damaged buildings in the besieged area of Homs
Man walk through damaged buildings in the besieged area of Homs January 25, 2014. REUTERS/Thaer Al Khalidiya (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)