A string of bomb attacks in Iraq have killed at least 89 people, and wounded 144 more, according to police and hospital sources.

In one of the bloodiest days in the past weeks, the explosions included a car bomb and a suicide attack, in and around the Iraqi capital Baghdad, as well as four car bombs in the northern oil city of Kirkuk.

In Taji, 20 km north of Baghdad, six blasts, including a car bomb, exploded near a housing complex, killing 14 people and wounding 29, sources said. When police arrived at the scene, another blast killed ten police officers.

Two car bombs struck near a government building in Sadr City, a Shi'ite neighbourhood in Baghdad, and in the northern, mainly Shi'ite area of Hussainiya, killing in total 16 people and wounding 73, police said.

It comes a day after car bombs in two towns south of Baghdad and in the Iraqi city of Najaf killed a total of 20 people and wounded 80.