Police officials say the Wednesday morning attack took place when gunmen opened fire on a bus carrying daily laborers who were on their way to a construction site near the city of Baqouba.
Baqouba is a former Sunni insurgent stronghold located some 35 miles northeast of the Iraqi capital.
A local medic confirmed the casualties. All officials spoke on condition of anonymity because they were not authorized to talk to the media.
Although the level of violence has ebbed in Iraq, deadly attacks on security forces and civilians are still common.
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