A police officer says the first attacker detonated his explosives-laden belt late Tuesday among a group of soldiers and Sahwa militiamen gathered in the orchard of a local militia leader in the town of Tarmiyah.
A second suicide bomber blew himself up at the gate of the compound as people tried to flee from the first explosion.
The officer says nine troops, including a brigade commander, and three militiamen were killed, and 23 were wounded. Tarmiyah, a former insurgent stronghold, is about 50 kilometers (30 miles) north of Baghdad.
A medical official confirmed the causality figures. Both spoke on condition of anonymity as they were not authorized to talk to media.
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