More than six months after falling to the Islamic State, the city center of Ramadi is under siege by Iraqi security forces and tribal fighters backed by American air power. Commanders say that as few as 300 militants remain holed up inside, behind a defense of elaborate tunnels, booby-trapped buildings and roads laced with hidden bombs. As Iraqi soldiers and tribal fighters have advanced on the city, clearing the outlying neighborhoods in preparation for what is expected to be a grueling and bloody fight for the center, they have discovered the things left behind by the Islamic State: lists of former government workers who repented to save their lives, and lists of others believed to have […]