Iraqi officials say a suicide car bombing has killed five policemen in Ramadi, a western city that is a former al-Qaida stronghold.
At least seven other people were wounded in Monday's attack in the capital of Iraq's Anbar province. Ramadi was previously one of Iraq's most dangerous towns until local Sunni tribes turned against al-Qaida militants in 2006 and 2007.
In other violence Monday, gunmen ambushed a bus carrying election workers in Abu al-Khasib near the southern Iraqi city of Basra. Two election officials were killed and a third was wounded.
Elsewhere, gunmen fired on a car carrying a Shi'ite cleric in the Zafaraniya district of southern Baghdad, killing him and wounding his wife. Three bombs also went off in the Iraqi capital in the Yarmuk, Mansur and Karrada districts, wounding 17 people, including nine policemen.
Also Monday, the number two U.S. commander in Iraq predicted that some Shi'ite militia leaders who fled to Iran for training and supplies will try to return to Iraq soon.
But, Army Lieutenant General Lloyd Austin says the militiamen will find it harder to win support for attacks because the Iraqi people have enjoyed several months of relative peace. Iran denies arming Shi'ite militants in Iraq.
Meanwhile, the U.S. military says coalition forces detained 11 suspected terrorists during operations targeting al-Qaida in central and northern Iraq on Monday and Sunday.
In other news, Lebanese officials say Prime Minister Fuad Siniora will travel to Baghdad this week for trade talks. It will be the first visit to Iraq by a Lebanese leader since the U.S.-led invasion in 2003.
King Abdullah of Jordan was the first Arab head of state to make a post-invasion trip to Iraq when he visited Baghdad on August 11.
Some information for this report was provided by AP and Reuters.