“The vengeance that Iraq’s Shiite militias mete out as they fight the Islamic State group can be just as brutal as that of their sworn sectarian enemies. In a grisly video recently posted online, a Shiite fighter shouts the name of a revered imam in victory as he poses beside decapitated bodies. Another militiaman sits nearby, grinning as he maims a corpse. One bearded militiaman explains the bodies are those of fighters who ‘killed our comrades.’ Another man shouts, ‘Our fighters were good guys. These are dogs.'”

Source: Iraqi Shiite militias grow brutal in anti-IS fight