Iraqi officials say three mortars have landed near the gate of a much-revered Shiite shrine in the city of Samarra, wounding at least nine people.
The golden domed al-Askari mosque in Samarra is one of the holiest shrines in Shiite Islam.
Sunni militants blew up the dome in 2006, helping trigger some of the country's worst sectarian bloodshed as Shiite extremists retaliated forcefully.
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Iraqi military spokesman Lt Gen Qassim al-Moussawi confirmed the attack and casualty figures.