A car bomb near a market in a Shiite-majority area of Baghdad killed 12 people and wounded at least 20 on Monday, a police officer and a medical official said.
The bombing in the Shaab area of north Baghdad brings the two-day death toll from violence in Iraq to 63.
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The car bombing came minutes after Prime Minister Nuri al-Maliki vowed to overhaul the country's security strategy, amid a wave of violence that has killed 340 people so far in May.
Violence in Iraq has fallen from its peak in 2006 and 2007 but attacks are still common, with more than 200 people killed in each of the first five months of this year.