Shiite fighters and Sunni fighters, who have joined Shiite militia groups known collectively as Hashid Shaabi ("Popular Mobilization") to fight the Islamic State, gesture Tuesday next to former Iraqi President Saddam Hussein's palaces in the Iraqi town of Ouja, near Tikrit. Thaier Al-Sudani/Reuters/Landov hide caption

toggle caption Thaier Al-Sudani/Reuters/Landov

In Tikrit Offensive, Local Sunnis, Shiite Militias Are Unlikely Allies

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Shiite militiamen pose with their banner (right) next to a captured — and upside-down — ISIS flag (left) in Tikrit, Iraq. Militias are bolstering Iraqi forces in a major operation to retake the city from the self-proclaimed Islamic State. Mohammed al-Mozani/AP hide caption

toggle caption Mohammed al-Mozani/AP

Iraq's push into Tikrit follows its retaking of the nearby town of al-Alam on Tuesday. There, a woman welcomed a relative who is fighting with a militia that's backing Iraqi troops. Thaier al-Sudani/Reuters /Landov hide caption

toggle caption Thaier al-Sudani/Reuters /Landov