In the capital Baghdad, 13 people were killed and 15 wounded when a suicide bomber blew himself up at an army recruitment centre.
Elsewhere in the city eight policemen were killed in heavy gunfire in two separate attacks, when insurgents attacked their patrol.
Security forces were also the focus for attacks in the northern city Mosul, where four Iraqi commandos were killed in a suicide car bombing.
Another car bomb killed a guard at the home of a senior defence official.
The attacks follow one of the worst days of bloodshed in which 46 people at a police recruiting centre were killed by a suicide bomber in the Kurdish city of Arbil.
It’s been a bloody week in Iraq with around 250 people killed just days after Iraq swore in its incomplete government.
But as the insurgents intensify attacks, the high Iraqi civilian toll is doing little for al-Qaeda’s chief terrorist in Iraq.
The US says it is receiving more tip-offs from Iraqis, suggesting a change in public opinion.
Meanwhile the US is investigating a new tactic insurgents are using to explode bombs.
According to US Lieutenant General James Conway, the attackers are now using remote controlled devices.
“We do have some indication that we’re seeing more remote detonation of some of the suicide bombers than we’ve had in the past,” said
Lt Gen Conway says these types of bombings began six months ago and appear to be increasing.
In other news, a US marine has been cleared of any wrongdoing after shooting an unarmed and wounded man in a Fallujah mosque last year.
The killing was videotaped by embedded journalist Kevin Sites, whose pictures caused an international scandal.
They showed the unnamed marine corporal shooting an unarmed man at close range.
The corporal was heard on the video suddenly shouting the wounded
Iraq, who was lying propped up against a wall inside the mosque, was “faking he’s dead.”
He was then seen raising his rifle and firing point blank at the Iraqi’s head.
A Marine Corps investigation ruled he acted in self- defence, saying “careful consideration was also given to the impact of the enemy’s known tactic of feigning death or surrender before attacking Marines.”
It’s a claim denied by Mr Sites, who spoke exclusively to SBS TV.
“I was with the platoon commander and he comes up to the squad that had been inside the mosque and he says “Are there people inside there?” and the marine that had been inside holds up five fingers signalling five people inside. And then the lieutenant asks “Did you shoot them?”, and the marine says “Roger that, sir.” And then the lieutenant asks “Were they armed?” and the marine just shrugs his shoulders.”