In Syria, anti-government rebels have forced an al-Qaeda-linked group to withdraw from its base in the northern city of Aleppo. Clashes among rebels have left hundreds of people dead in recent days, marking the deadliest infighting between the groups since the Syrian conflict began. The Islamic State of Iraq and the Levant was initially allied with other anti-government groups, but tensions among rebel factions erupted last week. The rebels who seized control of ISIL’s Aleppo base Wednesday found more than 40 bodies inside, sparking concerns the group is executing prisoners as they retreat.