Last weekend marked the third anniversary of Syria's civil war, a conflict that has, according to the Syrian Observatory for Human Rights, claimed the lives of more than 146,000 people, at least a third of them civilians. As forces loyal to Syrian President Bashar al-Assad appear to be making slow progress against rebel forces, the humanitarian crisis has grown astronomically -- as many as 2.5 million Syrians have now fled the country. Fractured rebel groups continue to fight each other, as well as Assad's troops, with civilians bearing the brunt of attack and counterattack, their neighborhoods reduced to rubble by mortar shells and barrel bombs. Gathered here are images from Syria over the past few months.