WANIYA, Iraq — The Shiite heartland of southern Iraq has generally been an oasis of calm in contrast to Baghdad and the central part of the country, but now violence is convulsing this city. Shiites are killing and kidnapping other Shiites, the police force is made up of competing militias and the inner city is a web of impoverished streets where idealized portraits of young men, killed in recent gun battles with Iraqi and American troops, hang from signposts above empty lots. From the NY Times article, Shiite Rivalries Slash at a Once Calm Iraqi City.