Updated at 1:25 a.m. EST, Mar. 10, 2007
At least three million Iraqis are in Karbala to observe Arbain ,which ends the forty-day period of mourning that began with the Ashura holiday; no deadly incidents were reported. Overall, at least 33 Iraqis were killed and five wounded in separate incidents elsewhere. Also, a Marine was killed in combat in Anbar province.
West of Baghdad, a U.S. air strike killed 12 gunmen waiting to ambush a passing U.S. patrol and destroyed anti-aircraft weaponry.
In Baghdad, ten unidentified bodies were found shot dead in several neighborhoods. Many of the dumped corpses, which are found on a daily basis, are bound, gagged, blindfolded or showing evidence of torture. It is believed they are victims of sectarian death squads.
Seven bodies were turned in at the Baquba hospital. They had been discovered by police and civilians in several different neighborhoods and were found bound and shot.
One suspected militant was killed and six others detained in Mosul.
Two militiamen were arrested in Fallujah and eight more suspects were detained in nearby Karma.
North of Karbala at al-Khanafus, a mortar round targeting pilgrims caused no casualties.
Police in Hit arrested 13 people wanted by security forces.
A woman and a child were wounded in Kirkuk when a car bomb exploded in front of their home.
The Arbain observence was free of violence; however, two car bombs were found in the desert near Karbala before they could be used.
Gunmen attacked a police station at Hibhib. One policeman was killed, three were wounded and ten are missing.
In Muqdadiyah, tribesmen killed the leader of a group of gunmen.
The sheikh of al-Mawali tribe was shot dead by gunmen in Haditha.
A communication tower in Ramadi was destroyed, but no casualties were reported.
Compiled by Margaret Griffis