Reuters quoted the mayor of Mahmudiyah, Muaid al-Amiri, as saying a car bomb had exploded at industrial workshops, demolishing the multistory building.
Four others died in a car bomb attack in Baghdad.
A policeman was killed when a roadside bomb targeted his patrol in Adhamiyah.
The U.S. military also announced today the deaths of four U.S. soldiers, killed northeast of Baghdad on April 7.
The Iraqi government recently announced its extension of a joint U.S.-Iraqi security offensive that began in the capital in February to other cities.
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