UDATED: Number of victims
At least 62 people have been killed and 180 injured in two car bomb attacks in central Baghdad, police say, according to BBC.
The blasts hit the ministry of justice and a provincial government office near the Green Zone, causing severe damage.
They came in quick succession at 1030 local time (0730 GMT) as people headed to work during the morning rush hour.
Correspondents say these are the largest attacks since 19 August, when truck bombs hit two ministry buildings and killed at least 100 people.
Iraq then blamed foreign fighters and accused Syria of involvement, demanding a UN investigation.
Plumes of smoke were seen rising in Baghdad on Sunday morning after two vehicles packed with explosives blew up just outside the Green Zone, the heavily-fortified administrative heart of the capital.
"The walls collapsed and we had to run out," Yasmeen Afdhal, a 24-year-old employee at the Baghdad Governorate told AP news agency.
"Why are they doing this to us?" shouted another man at the scene of that attack.
Iraqi officials say the number of dead and wounded is likely to rise, as rescue workers dig through the rubble to search for survivors.
The BBC's Gabriel Gatehouse in Baghdad said he felt the force of the explosions this morning, even though he was several miles away.
Our correspondent says it is too early to determine who is behind the attacks.
But he says the finger of blame is likely to point to insurgents or foreign fighters trying to destabilise the security situation ahead of Iraqi elections in mid-January.
Overall, violence has dropped dramatically in Iraq compared to a year ago, but sporadic attacks still continue in several parts of the country.