Drive-by gunmen and roadside bombs killed at least 11 people across Iraq on Monday, while police uncovered the bullet-riddled bodies of two men in Baghdad, police said.

One Iraqi policeman was killed and his brother, also a policemen, was wounded in an attack by armed men firing from a speeding car in the northern city of Kirkuk, said police Capt. Firhad Talabani.

In Baghdad's southern Abu Dashir neighborhood, police found the bodies of two more brothers seized from their home late Sunday by men claiming to be Interior Ministry commandos, said Lt. Maitham Abdul-Razzaq.

The two brothers, both Sunni Arabs, were shot repeatedly and found with their hands and legs bound.

Sunni Arabs accuse Shiite-backed security forces and militias of targeting their community in a campaign of sectarian killings.

Sectarian tensions are high ahead of the feast of Ashoura this week, which marks the seventh century death in battle of the revered Shiite saint Imam Hussein, grandson of Islam's Prophet Muhammad.

Sunni extremists have targeted the past two Ashoura festivals. Eight suicide bombers killed 55 Shiites last year. In 2004, at least 181 people died in bombings at Shiite shrines in Baghdad and Karbala.

An Iraqi soldier killed a member of radical Shiite cleric Muqtada al-Sadr's Mahdi militia, which was guarding a a group Shiites taking part in an Ashoura procession in northwestern Baghdad's Shula neighborhood, said police Capt. Qassim Hussein. It was unclear what sparked the incident.

In Basra, police killed a man who fired a machine-gun at a group of Shiites performing Ashoura ceremonies and threw a hand grenade at police forces, said Capt. Mushtaq Khadim. Two civilians and two policemen were also wounded during the clash.

Gunmen also killed an Iraqi working as an interpreter for British troops based in Basra, police said.

Drive-by gunmen killed a retired teacher, aged 60, and wounded his son in southern Baghdad; while a grocer, car dealer, former military intelligence official and an innocent bystander in three separate attacks in the capital's western suburbs.