A series of attacks across Iraq has killed 16 members of the security forces and civilians.
Police officials said the wave of attacks began with a roadside bomb in a commercial street in the northern city of Tikrit.
Minutes later, a car bomb struck policemen who had arrived to inspect the site of the first blast.
The officials say five policemen and two civilians were killed.
Tikrit is 130 kilometers north of Baghdad.
A suicide bomber also rammed his explosives-laden car into a security checkpoint near the town of Adeim about 100 kilometers north of Baghdad.
Three civilians and three police were killed.
Elsewhere, a roadside bomb hit a military checkpoint near the northern city of Mosul, killing two soldiers.
In the southern city of Basra, gunmen shot dead a police officer.
Based on reporting by AP and AFP