Iraq declared the city of Ramadi liberated from the Islamic State group on Monday and raised the national flag over its government complex after clinching a landmark victory against the jihadists.

Government forces swept the devastated streets for bombs after recapturing the city they lost in May and clinching a major victory against IS.

"Ramadi has been liberated and the armed forces of the counter-terrorism service have raised the Iraqi flag above the government complex," Brigadier General Yahya Rasool announced on state television.