Fighting intensifies over Syria's largest city
APTOPIX Mideast Syria
In this Friday, Sept 7, 2012 photo, a rebel Free Syrian Army soldier takes cover after a mortar shell hits a nearby building in Izaa district in Aleppo, Syria. Activists say more than 23,000 people have been killed in Syria since the uprising against the regime of President Bashar Assad began in March 2011. (AP Photo/Manu Brabo)