According to Iraqi security officials, at least 13 people were killed following two separate bomb explosions in Musayyib and Kirkuk cities of Iraq.
The officials further added, two brothers working for the Iraqi police and eight of their relatives were killed after insurgents stormed their house in Musayyib in the south of Baghdad.
At least three others were killed in a separate explosion in Kirkuk, officials said.
The wave of insurgency has been rampant in Iraq since US troops left the country last month.
In the deadliest attack, a 4:00 am (0100 GMT) bombing in Mussayib, 60 kilometres (37 miles) south of Baghdad, struck the home of policemen Ahmed and Jihad Zuwaiyin as they and their families slept.
A police officer in the Babil provincial capital Hilla and a doctor at Mussayib hospital quoted by AFP said, the explosion killed 10 members of the family — the two officers, their wives, and six children aged 10 or younger.
Police Brigadier General Adil Zain al-Abidine told AFP the attack in the northern city of Kirkuk was caused by a motorcycle bomb parked near a primary school in the city centre.
As well as the three fatalities, five others were also injured.
Violence is down from its peak in 2006 and 2007, but attacks remain common.
According to an AFP tally, more than 200 people have been killed in attacks since American forces completed their pullout from Iraq on December 18.
