At least 11 people have been killed and dozens more injured in four attacks across Iraq.

The deadliest attack killed five people and wounded dozens more in a market in the city of Hillah, in Babil province.

The cause of Sunday's explosion was a bomb attached to a cooler on the back of a bicycle, police said.

At least three more people were feared dead after a bomb fixed to a bus was remotely detonated in Karbala.

The bus had been approaching a checkpoint and a police officer was said to have been among the dead.

Medics said at least five women were among the many injured.

Twin car bombs, detonated within minutes of each other, killed two people in a second attack in Ramadi.

Among the dead was a policeman. Four other people were hurt.

The devices had been left in cars parked in the visitors' car park at the Traffic Police Department.

Earlier in the day, three mortar rounds slammed into the commercial district of Baghdad, killing one.

Last week twin suicide bomb attacks in central Baghdad killed 153 people and wounded about 500 more. The strikes constituted the deadliest day for the country in two years.

The violence comes before parliamentary elections due on January 16.