A double bombing has killed seven people north of Baghdad.
Police say the attack happened on Saturday morning when a roadside bomb exploded in a commercial street in the city of Tikrit.
Minutes later, a car bomb struck officers arriving to inspect the first blast.
Officials say five policemen and two civilians were killed and 18 people were wounded in the bombings.
Violence has spiked in Iraq since last April, a surge unseen since 2008. The relentless attacks have become the government's most serious challenge.
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