A damaged building is pictured after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo
A damaged building is pictured after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo May 17, 2014. REUTERS/Hosam Katan (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Members of the Civil Defence use a machinery to remove debris from damaged buildings while looking for survivors at Al-Kallaseh in Aleppo
Members of the Civil Defence use a machinery to remove debris from damaged buildings while looking for survivors after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo May 17, 2014. REUTERS/Hosam Katan (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A girl runs amid debris after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo
A girl runs amid debris after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo May 17, 2014. REUTERS/Hosam Katan (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A resident looks for survivors amid damage in what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo
A resident looks for survivors amid damage in what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo May 17, 2014. REUTERS/Hosam Katan (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A man uses a machinery to gather debris from damaged buildings at Al-Kallaseh in Aleppo
A man uses a machinery to gather debris from damaged buildings after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo May 17, 2014. REUTERS/Aref Haj Youssef (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A member of the Civil Defence holds a sledgehammer as he and his colleagues look for survivors among debris and damaged buildings at Al-Kallaseh in Aleppo
A member of the Civil Defence holds a sledgehammer as he and his colleagues look for survivors among debris and damaged buildings after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo May 17, 2014. REUTERS/Aref Haj Youssef (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A woman salvages belongings amidst debris and damaged buildings at Al-Kallaseh in Aleppo
A woman salvages belongings amidst debris and damaged buildings after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo May 17, 2014. REUTERS/Aref Haj Youssef (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
A man covered with dust stands among debris at Al-Kallaseh in Aleppo
A man covered with dust stands among debris after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo May 17, 2014. REUTERS/Aref Haj Youssef (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Members of the Civil Defence look for survivors after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo
Members of the Civil Defence look for survivors after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo May 17, 2014. REUTERS/Aref Haj Youssef (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)
Residents inspect the damage after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo
Residents inspect the damage after what activists said was shelling from forces loyal to Syria's President Bashar al-Assad at Al-Kallaseh in Aleppo May 17, 2014. REUTERS/Aref Haj Youssef (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT)