Iraqi officials say two separate bombings have killed eight people in and around the capital.

Police officials say the first attack happened Monday afternoon when a roadside bomb explosion hit a patrol of anti-militant fighters, known as Sahwa, in the town of Madain, just south of Baghdad, killing three fighters and one civilian.

The Sahwa are made up of Sunni militiamen who joined U.S. troops in the fight against al-Qaida during the height of Iraq's insurgency in 2007 and 2008.

In a later attack, police say a sticky bomb attached to a minibus exploded in Baghdad's southern district of Abu Dashir, killing four passengers and wounding six people.

Medical officials confirmed the causalities. All officials spoke on condition of anonymity as they were not authorized to release information.