An interior ministry official said that the blast struck at around 7:30 am (0430 GMT) in the Ameen area of east Baghdad, during rush hour Wednesday morning also wounded 10 other passers-by and damaged storefronts.
Medical sources said the Ibn al-Nafis and Al-Kindi hospitals had received three bodies and nine wounded people between them.
All officials spoke on condition of anonymity because they were not authorized to release the information.
Violence in Iraq is down from its peak in 2006 and 2007, but attacks remain common, killing 151 people in January.
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