DUBAI - Al-Qaeda's front-group in Iraq claimed in an online statement responsibility for the twin suicide bombings that ripped through the centre of Baghdad killing around 100 people, a US-based monitoring group said Tuesday.

The self-proclaimed Islamic State of Iraq said the attacks were within its campaign dubbed the "Invasion of the Captive," SITE Intelligence said.

The near-simultaneous car bombings which targeted on Sunday the justice ministry and the Baghdad provincial government headquarters also wounded more than 500 and left body parts and charred corpses scattered around the streets of the capital.

Defence ministry spokesman Major General Mohammed al-Askari had told AFP that the evidence found confirmed the bombers were linked to Al-Qaeda and supporters of the Baath Party of executed dictator Saddam Hussein.