A series of car bombs in and around the Iraqi capital, Baghdad, have left at least eight people dead and 30 others injured, Press TV reported.
Iraqi officials reported six separate attacks between 7:00 a.m. (0400 GMT) and around 10:30 a.m. on Sunday.
One car bomb struck a bus carrying Iranian pilgrims in north Baghdad, killing one person and wounding eight others, Iraq's interior ministry said.
Shia pilgrims have flocked by the thousand to Iraq's cities of Karbala, Najaf and Baghdad to commemorate the Arbaeen mourning ceremonies.
Arbaeen marks 40th day to pass following the anniversary of the martyrdom of the third Shia imam, Imam Hussein (PBUH).
Meanwhile in the capital's southwest, a car bomb targeted a police patrol, taking the lives of two people -- one of them a policeman. Eight people, including four officers were among the injured in that attack.
Another vehicle packed with explosives was detonated on the banks of the Tigris River, which snakes through the capital, leaving one person dead and six people wounded.
Two others were killed and four injured in a similar explosion, some 25 km north of Baghdad.
In a separate car bomb attack, two teenage boys, aged 13 and 14, were killed when a roadside bomb targeting a militiaman exploded.
First Lieutenant Nashat Sarhan said the militiaman -- who is a member of the Sahwa (Awakening) forces that has sided with the US military from late 2006 -- was left unharmed.
Four people, including a policeman, were also reportedly wounded in central Baghdad.
Sunday's car bombings follow a wave of violence across Iraq in recent days.
More than 100 people lost their lives and scores more were wounded last week in a spate of attacks targeting Iraqi security forces and pilgrims.
The recent spike in violence comes just weeks after Prime Minister Nouri al-Maliki formed a new government, ending a political stalemate since the March elections.