The morning attack in Tikrit, north of Baghdad, also wounded more than 30, said Iraqi health official Raed Ibrahim.
Qutayba al-Jabouri, a lawmaker from the Salahuddin province to which Tikrit belongs, also confirmed the incident.
There was no immediate claim of responsibility, but the attack was typical of al-Qaida's Iraq branch, the Islamic State of Iraq.
The militant Sunni group frequently uses car bombs, suicide bombers and coordinated blasts to target Shiites and those working with the Shiite-led government of Prime Minister Nouri al-Maliki.
Iraqi intelligence officials say that the country's al-Qaida branch is strengthening as it takes advantage of chaos in neighboring Syria to smuggle in arms, weapons and fighters.
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