A suicide bomber has killed more than 20 people who were queuing outside an army recruiting centre in the Iraqi capital Baghdad.
Suicide bombings are an everyday occurrence in Iraq
The attacker walked into a crowd of young men who were waiting to be signed up by the military and blew himself up.
At least six people were killed in further suicide bomb attacks in the northern cities of Kirkuk and Mosul.
And it has emerged that gunmen killed at least eight members of a family as they slept in their home in Baghdad.
Neighbours of the Tarash family in the eastern Baladiyat district found the bodies on Sunday and informed the father, who had spent the night elsewhere.
They said the mother and her children - the youngest of whom was two years old - had been shot in the head in their sleep.
The father, Hussein Tarash, said he had no enemies and it was a sectarian attack on his family, which is Shia.
The suicide attack in Baghdad, which left more than 40 people injured, was claimed by al-Qaeda's Iraq wing in an internet posting that could not be verified.
The BBC's Richard Galpin, in the Iraqi capital, says the army recruitment office has been attacked seven times before, but potential recruits still have to queue outside the building - making them an easy target.
An official at the ministry of defence said he could not explain why the potential recruits had been left so exposed, adding that those in charge of the centre had been told not to make the same mistake.
Our correspondent says it is a testament to the desperation of Iraqi people to find work that they are still prepared to take the risk of trying to join the security forces.
It is estimated that about half of the country's workforce is unemployed. Jobs in the Iraqi security forces are relatively well-paid, but insurgents view members as collaborators with US-led forces in Iraq.
The Kirkuk suicide bombing saw three people killed and at least 10 others injured when the attacker detonated explosives in his car outside municipal buildings in the city centre.
In Mosul, at least four policemen were killed and three were wounded when a suicide bomber in a car rammed the motorcade of a district police chief.