ALEPPO, Syria: More than 300 civilians have been killed in a three-week surge of fighting and bombardment in Syria’s devastated Aleppo city, a monitoring group said on Saturday. The battle for Syria’s second city has killed 333 civilians since July 31, when rebels launched a major push to break a government siege of districts under their control. The toll includes 165 civilians—among them 49 children—killed in opposition fire on the city’s government-held western districts. Another 168 civilians died in Russian and regime air strikes and shelling on its rebel-controlled eastern neighborhoods, the Observatory said. Russia has been carrying out air raids in support of President Bashar al-Assad’s forces in Syria since September 2015.