Baghdad: Iraqi security forces fired tear gas, water cannons and live ammunition as protesters stormed Baghdad's centre of government on Friday, escalating weekly protests against the slow pace of change under Prime Minister Haidar al-Abadi.

At least four people were killed and 90 injured as riot police attempted to dislodge the anti-corruption protesters, hospital sources said.

Iraqi riot police spray water and tear gas at the protesters. Credit:AP

Chanting "our Army, the country is wounded, don't side with corruption," demonstrators forced their way into the Green Zone, the secure complex in the heart of the capital that has housed Iraq's government buildings, parliament and embassies since 2003.