A series of attacks across Iraq, including a suicide bombing targeting soldiers and a drive-by shooting, have killed at least 16 people.
Sunday's deadliest attack happened in the northern city of Mosul, where a suicide bomber attacked an army patrol, killing four officers and four soldiers.  The attack also wounded nine soldiers and four civilians.
In Abu Ghraib, west of Baghdad, four Sahwa anti-al-Qaida militiamen were killed and at least three wounded when gunmen attacked their checkpoint.
Insurgents have stepped up attacks across Iraq in the past months, sending violence to levels not seen since 2008, when sectarian killings nearly tore the country apart in the wake of the U.S.-led invasion. 
According to United Nations estimates, more than 8,000 people have been killed so far this year.