Seven people have been killed in a bomb attack in Baghdad apparently targeting a senior interior ministry official, a government spokesman said.
A series of suicide car bombings in the northern Iraqi city of Kirkuk has killed at least 11 people and injured dozens of others, police say.
The bomb struck as the convoy of ministry finance chief, Hala Shakr Salim, was driving through the eastern district of Mustansiriya.
Three attacks appeared to target police while the fourth bomb went off near a teacher training college, they said.
Five bystanders and two of Ms Shakr's bodyguards were killed, while two cars were damaged by the blast.
Earlier, a bomb attack in Baghdad that hit the convoy of a senior interior ministry official killed seven people.
Up to eight people were reported wounded but Ms Shakr was unhurt.
The attacks are the latest in a surge of violence of all types in Iraq during the Muslim fasting month of Ramadan.
The interior ministry is unpopular with many Iraqi Sunnis, who believe the ministry harbours Shia death squads accused of sectarian attacks.
'Rights violations'
The ministry, which is in charge of Iraq's police force, launched an inquiry into the issue in February after US military officials claimed they had caught Iraqi police in the act of carrying off victims.
Spokesman Abdul Karim Khalaf told Associated Press on Sunday that the ministry was undergoing a major reshuffle and had removed 3,000 employees since May because of suspected corruption or human rights violations.
About 600 of them would face prosecution, he said.
Earlier this month the ministry suspended an entire brigade of 700 police because of suspected militia sympathies.
Another roadside bomb killed a man and wounded two others in Baghdad's Amil district.
Elsewhere, a roadside bomb exploded next to a convoy of US military vehicles in the al-Ghadeer neighbourhood, in southeastern Baghdad, setting one of the vehicles on fire, Iraqi police said.
The blast wounded two civilians, said police.
There was no immediate comment on other casualties, but US troops immediately sealed off the blast scene.
Thick smoke could be seen billowing from the vehicle.
