A militant group linked to al-Qaeda has said it carried out four connected suicide bombings in the Iraqi capital on Tuesday that left scores dead.
The Islamic State of Iraq posted the claim on a website used by militants, news agencies reported on Thursday.
The attacks on government-run buildings in Baghdad killed at least 127 people and wounded 400, according to police sources.
US Defence Secretary Robert Gates arrived in Baghdad on Thursday.
He is on an unannounced visit at a time when the US is making preparations to reduce its troop levels from next year.