BAGHDAD: A gunman fired on a government compound to allow a suicide bomber to blow himself up north of Baghdad on Sunday, the deadliest incident in nationwide violence that killed four.
The attacks were the latest in a surge in unrest that has killed more than 3,900 people already this year, raising concerns that Iraq is slipping back into the all-out sectarian war that plagued the country in 2006 and 2007, leaving tens of thousands dead.
In Sunday's bloodiest attack, a gunman fired on a police station inside a government complex in an ethnically-mixed town northeast of Baghdad, giving covering fire for a suicide bomber to blow himself up.
Overall, two people were killed, including a policeman, and seven others were wounded, officials said.
Gunmen also attacked a checkpoint in northern Nineveh province, killing a policeman, while a magnetic "sticky bomb" attached to a car killed an official from the ministry of electricity in a town south of Baghdad.
Violence has surged in Iraq since the beginning of the year, and is now at its highest level since 2008.
Authorities have responded with wide-ranging security operations targeting militants, but diplomats and analysts say these are not addressing the root causes of the violence.