Both sides of the Syrian conflict are facing new accusations of committing atrocities. Opposition activists say government forces killed at least 50 people on Tuesday in an attack on a suburb of Damascus. Rebels forces, meanwhile, released video footage of the execution of four alleged pro-regime fighters seized in the ongoing battle for Aleppo. The video shows the bloodied fighters being led into a courtyard before they are mowed down in a hail of gunfire. The violence in Aleppo is intensifying, with government forces using fighter jets to carry out bombings and rebel groups deploying tanks.