A boy works in the city of Aleppo
A boy works in the city of Aleppo March 22, 2014. REUTERS/Mahmoud Hebbo (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT SOCIETY)
A man holds a wounded boy at a site hit by shelling in Arbeen
A man holds a wounded boy at a site hit by what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in Arbeen, in the eastern Damascus suburb of Ghouta, March 22, 2014. REUTERS/Diaa Al-Din (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY)
People walk as others ride their bicycles at a site hit by shelling in Arbeen
People walk as others ride their bicycles at a site hit by what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in Arbeen, in the eastern Damascus suburb of Ghouta, March 22, 2014. REUTERS/Diaa Al-Din (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY)
Smoke rises as people run at a site hit by shelling in Arbeen
Smoke rises as people run at a site hit by what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in Arbeen, in the eastern Damascus suburb of Ghouta, March 22, 2014. REUTERS/Ammar al-Bushy (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY)
Smoke rises as people run at a site hit by shelling in Arbeen
Smoke rises as people run at a site hit by what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in Arbeen, in the eastern Damascus suburb of Ghouta, March 22, 2014. REUTERS/Ammar al-Bushy (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Smoke rises as people run at a site hit by shelling in Arbeen
Smoke rises as people run at a site hit by what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in Arbeen, in the eastern Damascus suburb of Ghouta, March 22, 2014. REUTERS/Ammar al-Bushy (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Smoke rises as boys run at a site hit by shelling in Arbeen
Smoke rises as boys run at a site hit by what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in Arbeen, in the eastern Damascus suburb of Ghouta, March 22, 2014. REUTERS/Ammar al-Bushy (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY)
Rebels battle for Syria border post near Mediterranean
Islamist fighters in Syria battle President Bashar al-Assad's forces for control of a border crossing with Turkey, part of an offensive aimed at opening up a rebel link to the sea
A Free Syrian army fighter holds a missile in Sheikh Najjar in Aleppo
A Free Syrian army fighter holds a missile in Sheikh Najjar in Aleppo March 20, 2014. Picture taken March 20, 2014. REUTERS/Houssam Abo Dabak (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Free Syrian Army fighters carry a weapon in Sheikh Najjar in Aleppo
Free Syrian Army fighters carry a weapon in Sheikh Najjar in Aleppo March 20, 2014. Picture taken March 20, 2014. REUTERS/Houssam Abo Dabak (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)