Bombings in Iraq on Wednesday killed at least 19 people and wounded 58, mainly around Nineveh province, where political tensions have recently flared between Arabs and Kurds.

Even as Iraq's Sunni-Shi'ite divide appears to be tenuously mending, another seam in the country's patchwork multiethnic and sectarian society is on the verge of unraveling. Territorial disputes between Arabs and Kurds — in the provinces of Nineveh, Kirkuk and Diyala — now pose a serious risk of violence. In recent months, long-standing hostility between the two communities has escalated, whipped up by resurgent Arab secular nationalism. At the federal level, Prime Minister Nouri al-Maliki has repeatedly said he ...

Mosul remains at war. Although the conflict in most parts of Iraq has largely subsided — the uneasy peace punctured only sporadically by spurts of bloodshed — it isn't over in Mosul. Al-Qaeda and other insurgent groups remain a force in this majority Sunni, ethnically and religiously mixed northern city, Iraq's third largest. The meandering Tigris River cuts Mosul into a larger, tamer "green" eastern section and a violent and insecure "red" west, the heart of the crisis. Graffiti lauding ...