A Free Syrian Army fighter smokes a cigarette during what activists said were clashes with pro-government forces in Old Aleppo
A Free Syrian Army fighter smokes a cigarette while holding his weapon during what activists said were clashes with pro-government forces in Old Aleppo, December 28, 2013. REUTERS/Abdalrhman Ismail (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Free Syrian Army fighters stand in shooting position during what activists said were clashes with pro-government forces, in Old Aleppo
Free Syrian Army fighters stand in shooting position during what activists said were clashes with pro-government forces, in Old Aleppo, December 28, 2013. REUTERS/Abdalrhman Ismail (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Free Syrian Army fighters take a rest by a fire in Old Aleppo
Free Syrian Army fighters take a rest by a fire in Old Aleppo, December 28, 2013. REUTERS/Abdalrhman Ismail (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A girl who was rescued from under rubble, after what activists said was shelling by forces loyal to President al-Assad, lies in hospital bed in Aleppo
A girl who was rescued from under a rubble, after what activists said was shelling by forces loyal to Syria's President Bashar al-Assad, lies in a field hospital bed in Aleppo, December 28, 2013. About 40 people died after shelling in Aleppo on Saturday, activists said. REUTERS/Ahmad Othman (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A man carries child who survived after being under rubble, after what activists said was shelling by forces loyal to President al-Assad in Aleppo
A man carries a child who survived after being under rubble, after what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in Aleppo, December 28, 2013. About 40 people died from shelling in Aleppo on Saturday, activists said. REUTERS/Ahmad Othman (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Members of Islamist Syrian rebel group Jabhat al-Nusra man checkpoint on border crossing between Syria and Jordan in Daraa
Members of Islamist Syrian rebel group Jabhat al-Nusra man a checkpoint on the border crossing between Syria and Jordan, which they claim to have taken control of, in Daraa December 26, 2013. Picture taken December 26, 2013. REUTERS/Ammar Khassawneh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Syrian refugee children look from behind fence outside family camp in Darashakran refugee camp, on outskirts of Arbil
Syrian refugee children look from behind a fence outside their family camp in Darashakran refugee camp, on the outskirts of Arbil, in Iraq Kurdistan region, December 28, 2013. REUTERS/ stringer (IRAQ - Tags: POLITICS CONFLICT SOCIETY IMMIGRATION TPX IMAGES OF THE DAY CIVIL UNREST)
A car drives through a damaged border crossing between Syria and Jordan in Daraa
A car drives through a damaged border crossing between Syria and Jordan, which Islamist Syrian rebel group Jabhat al-Nusra claim to have taken control of, in Daraa December 26, 2013. Picture taken December 26, 2013. REUTERS/Ammar Khassawneh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT TRANSPORT)
A damaged building is pictured at the border crossing between Syria and Jordan in Daraa
A damaged building is pictured at the border crossing between Syria and Jordan, which Islamist Syrian rebel group Jabhat al-Nusra claim to have taken control of, in Daraa December 26, 2013. Picture taken December 26, 2013. REUTERS/Ammar Khassawneh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A member of Islamist Syrian rebel group Jabhat al-Nusra mans checkpoint on border crossing between Syria and Jordan, in Daraa
A member of Islamist Syrian rebel group Jabhat al-Nusra mans a checkpoint on the border crossing between Syria and Jordan, which they claim to have taken control of, in Daraa December 26, 2013. Flag reads, "There is no God but Allah, and Muhammad is his prophet. Al-Nusra front, al-Qaeda in the Levant". Picture taken December 26, 2013. REUTERS/Ammar Khassawneh (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)