At least 28 people have been killed and 25 wounded in a double suicide bombing at the interior ministry in the Iraqi capital Baghdad.
Iraqi police had opened fire on one of the bombers because he looked suspicious, but the bullets detonated explosives strapped to the man's body.
A second bomber then detonated his explosives as police gathered around the remains.
The bombings were claimed by al-Qaeda's branch in Iraq, which said the attacks were to avenge the 'torture' of Sunni Muslims at the interior ministry.
A ceremony celebrating the anniversary of the formation of the Iraqi police force was taking place at the police academy next door at the time of the blasts.
The ministry has been attacked by insurgents on several previous occasions.
The latest bloodshed came as the electoral commission announced a delay in releasing its findings into fraud allegations in last month's Iraqi elections.
The delay will give extra time to a group of foreign monitors to finish a separate probe into the 15 December poll, the first to since the fall of Saddam Hussein in April 2003.
The International Mission for Iraqi Elections has been observing how the commission conducted vote counting and handled complaints by Sunni-based and secular parties who have alleged widespread electoral fraud.
