Three people have been killed and 30 injured in a suicide bombing in Baquba, the second deadly attack in the central Iraqi city in as many days.
The bomber blew up his vehicle outside a police headquarters, just a few streets from Wednesday's attack on another police compound that killed 14.
On Tuesday, a suicide bomber killed about 60 people at a police recruitment centre in the town of Tikrit.
Violence in Iraq has reduced in recent years although deadly attacks continue.
That is a source of concern about Iraqi security as US forces prepare to withdraw later this year.
'Rain of shrapnel'
Two policemen and a woman bystander were killed in Thursday's attack in Baquba, 60km (37 miles) north-east of Baghdad.
The vehicle was driven at the gates of the compound but did not break through, police said.
Government worker Murtada Aiseh told Agence France-Presse news agency: "I heard a massive blast and suddenly there was a rain of shrapnel falling from the sky.
"I woke up in the hospital and found my wife near my bed. She suffered injuries to her right hand."
Seven policemen were among the wounded, officials said.
In Wednesday's attack in Baquba, a suicide bomber used an ambulance to attack another police compound. In addition to the dead, more than 60 injuries were reported.
On Tuesday in Tikrit, the home town of former Iraqi leader Saddam Hussein, a suicide bomber joined a queue of about 100 police volunteers and detonated explosives.
Wednesday's blast in Baquba left 14 dead
Both Baquba and Tikrit are within what is known as the Sunni Triangle, a stronghold of Iraq's insurgency.
Separately on Thursday a roadside bomb apparently targeting Shia pilgrims exploded in southern Baghdad, killing one worshipper and wounding nine more.
Overall violence in Iraq has fallen sharply since the height of the sectarian killings of 2006-07, but shootings and bombings remain a daily occurrence.
US forces formally ended their combat operations last August, ahead of a planned full withdrawal later this year.
