People who have been displaced due to fighting between rebels and forces of Syrian President Assad walk at Bab Al-Nour IDP camp
People who have been displaced due to the fighting between rebels and the forces of Syrian President Bashar al-Assad walk at the Bab Al-Nour internally displaced persons (IDP) camp, north of Aleppo, beside the Syrian-Turkish border May 18, 2014. REUTERS/Jalal Al-Mamo (SYRIA - Tags: CIVIL UNREST CONFLICT SOCIETY)
People who have been displaced due to fighting between rebels and forces of Syrian President Assad sit under a shade at Bab Al-Nour internally displaced persons camp
People who have been displaced due to the fighting between rebels and the forces of Syrian President Bashar al-Assad sit under a shade at the Bab Al-Nour internally displaced persons (IDP) camp, north of Aleppo, beside the Syrian-Turkish border May 18, 2014. REUTERS/Jalal Al-Mamo (SYRIA - Tags: CIVIL UNREST CONFLICT SOCIETY)
Free Syrian Army fighters rest at a checkpoint in the Idlib countryside
Free Syrian Army fighters rest at a checkpoint in the Idlib countryside May 18, 2014. REUTERS/Hamid Khatib (SYRIA - Tags: CIVIL UNREST CONFLICT)
Syria air defence head killed, rebels take northern town
More than 150,000 people have been killed in Syria's civil war, which erupted three years ago
Syria air defence head killed near Damascus, rebels and activists say
Gen. Hussein Ishaq reportedly died of wounds suffered during offensive by Assad's forces against rebels
A man covered in dust rests among the debris at a site in al-Katerji district in Aleppo
A man covered in dust rests among the debris at a site hit by what activists said were two barrel bombs dropped by forces loyal to Syria's President Bashar al-Assad in al-Katerji district in Aleppo May 18, 2014. REUTERS/Hosam Katan (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY)
A damaged building is pictured at a site in al-Katerji district in Aleppo
A damaged building is pictured at a site hit by what activists said were two barrel bombs dropped by forces loyal to Syria's President Bashar al-Assad in al-Katerji district in Aleppo May 18, 2014. REUTERS/Hosam Katan (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Residents inspect the damage at a site in al-Katerji district in Aleppo
Residents inspect the damage at a site hit by what activists said were two barrel bombs dropped by forces loyal to Syria's President Bashar al-Assad in al-Katerji district in Aleppo May 18, 2014. REUTERS/Hosam Katan (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A member of the Civil Defence removes debris at a site at al-Katerji district in Aleppo
A member of the Civil Defence removes debris at a site hit by what activists said were two barrel bombs dropped by forces loyal to Syria's President Bashar al-Assad at al-Katerji district in Aleppo May 18, 2014. REUTERS/Hosam Katan (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Residents inspect the damage at a site in al-Katerji district in Aleppo
Residents inspect the damage at a site hit by what activists said were two barrel bombs dropped by forces loyal to Syria's President Bashar al-Assad in al-Katerji district in Aleppo May 18, 2014. REUTERS/Hosam Katan (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)