BAGHDAD - Iraqi officials say at least 11 people have been killed and dozens injured in a day of violent clashes across the country between security forces and demonstrators.

At least nine demonstrators were killed in separate clashes in three northern Iraqi cities during what was described as a "Day of Rage." In the western Anbar province at least two people were killed as security forces and demonstrators battled.

Thousands of Iraqis took to the streets Friday to vent their anger at government corruption, a lack of services and unemployment in the largest outpouring of anger since the protests began sweeping the Middle East.

In the capital of Baghdad, demonstrators trying to cross a bridge battled security forces and knocked down concrete barriers.