A boy stands with Free Syrian Army fighters as they pray in Aleppo's Karm al-Jabal district
A boy stands with Free Syrian Army fighters as they pray in Aleppo's Karm al-Jabal district March 17, 2014. REUTERS/Jalal Al-Mamo (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Free Syrian Army fighters prepare to fire a rocket towards forces loyal to Syria's President Bashar al-Assad in the old city of Aleppo
Free Syrian Army fighters prepare to fire a rocket towards forces loyal to Syria's President Bashar al-Assad in the old city of Aleppo March 17, 2014. REUTERS/Jalal Al-Mamo (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A view shows a damaged building in Aleppo's Karm al-Jabal district
A view shows a damaged building in Aleppo's Karm al-Jabal district March 17, 2014. REUTERS/Jalal Al-Mamo (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A general view shows damaged buildings along a deserted street in Aleppo's Karm al-Jabal district
A general view shows damaged buildings along a deserted street in Aleppo's Karm al-Jabal district March 17, 2014. 'Attention, sniper' reads on rubble of a damaged building (L). REUTERS/Jalal Al-Mamo (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Sunni Muslim gunman fires his weapon in the Sunni Muslim neighbourhood of Bab al-Tebbaneh in Tripoli
A Sunni Muslim gunman fires his weapon in the Sunni Muslim neighbourhood of Bab al-Tebbaneh in Tripoli, northern Lebanon March 17, 2014. In Tripoli the army clashed overnight with fighters who fired rockets at military posts in the northern coastal city, security sources said. Twelve people have been killed in four days of fighting triggered by tensions between Sunni Muslims and minority Alawites, from the same faith as the Syrian president. REUTERS/Omar Ibrahim (LEBANON - Tags: POLITICS CIVIL UNREST CONFLICT)
Sunni Muslim gunmen take up positions with weapons in Sunni Muslim neighbourhood of Bab al-Tebbaneh in Tripoli
Sunni Muslim gunmen take up positions with their weapons in the Sunni Muslim neighbourhood of Bab al-Tebbaneh in Tripoli, northern Lebanon March 17, 2014. In Tripoli the army clashed overnight with fighters who fired rockets at military posts in the northern coastal city, security sources said. Twelve people have been killed in four days of fighting triggered by tensions between Sunni Muslims and minority Alawites, from the same faith as the Syrian president. REUTERS/Omar Ibrahim (LEBANON - Tags: POLITICS CIVIL UNREST CONFLICT)
Sunni Muslim gunmen carry weapons as they run past barricades and piled sandbags in Sunni Muslim neighbourhood of Bab al-Tebbaneh in Tripoli
Sunni Muslim gunmen carry their weapons as they run past barricades and piled sandbags in the Sunni Muslim neighbourhood of Bab al-Tebbaneh in Tripoli, northern Lebanon March 17, 2014. In Tripoli the army clashed overnight with fighters who fired rockets at military posts in the northern coastal city, security sources said. Twelve people have been killed in four days of fighting triggered by tensions between Sunni Muslims and minority Alawites, from the same faith as the Syrian president. REUTERS/Omar Ibrahim (LEBANON - Tags: POLITICS CIVIL UNREST CONFLICT)
A view of a closed street in town Al-Labwa which leads to town of Arsal, in eastern Bekaa Valley
A view of a closed street in the town of Al-Labwa which leads to the town of Arsal, in the eastern Bekaa Valley March 17, 2014. Two rockets struck a mainly Shi'ite town near Lebanon's border with Syria on Monday and security forces blew up a suspected car bomb as they struggled to contain sectarian violence fuelled by a Syrian army offensive across the frontier. REUTERS/Hassan Abdallah (LEBANON - Tags: POLITICS CIVIL UNREST CONFLICT)
A woman walks past a closed street in the town Al-Labwa which leads to the town of Arsal
A woman walks past a closed street in the town Al-Labwa which leads to the town of Arsal, in the eastern Bekaa Valley March 17, 2014. Two rockets struck a mainly Shi'ite town near Lebanon's border with Syria on Monday and security forces blew up a suspected car bomb as they struggled to contain sectarian violence fuelled by a Syrian army offensive across the frontier. REUTERS/Hassan Abdallah (LEBANON - Tags: POLITICS CIVIL UNREST CONFLICT)
U.S. names envoy to replace retiring ambassador to Syria
USA-SYRIA/ENVOY:U.S. names envoy to replace retiring ambassador to Syria