A wave of bombings in six Iraqi provinces, including 10 locations in Baghdad, has killed 83 people and wounded nearly 300, Iraqi police say.
Many of the dead in the Iraqi capital were Shia pilgrims gathering for a religious festival.
In Hilla, two car bombs exploded near a restaurant, killing at least 21 people.
There has been a wave of attacks on the Shia community in recent days, as it marks the anniversary of the death of Shia imam Moussa al-Kadhim.
It’s been another bloody morning – a multitude of car bombs, IEDs and machine-gun attacks.
In Baghdad, policemen and Shia pilgrims – many who had come on foot from across the country – bore the brunt of the assaults, while an employee of a private university was also targeted when his house was bombed.
Soon after the attacks, websites of local political parties critical of Shia Prime Minister Nouri Maliki blamed the political crisis in which Iraq has been embroiled for the past few months.
But Mr Maliki’s State of Law coalition pointed the finger of blame at the recent failure of attempts by the prime minister’s rivals to topple him with a vote of no-confidence.
A man who witnessed one of the attacks in Baghdad said a car bomb had targeted pilgrims and had also hit people who were working in the city.
“People were slaughtered and killed right here. This wrecked car here belonged to a man who worked to earn his living, and another one belonged to a fuel seller. They could not find his body.”
The restaurant that came under attack in Hilla is said to be frequented by police.
Pictures from the scene showed the mangled remains of a restaurant, damaged cars and roads strewn with debris.
Three bombs exploded in Kirkuk, with one of them targeting the headquarters of Kurdish president Massoud Barzani. One person died and many were injured in that attack.
One man told Reuters: “I want to ask the government, why do they put party headquarters in residential areas and among the civilians? Bombs are still occurring , killing and hurting innocent people.”
There are also reports of bombs in Al-Azizyah, south of Baghdad, in Mosul, and another north of Karbala.
It is not yet clear who is responsible for Wednesday’s attacks.
Four people were killed in a mortar attack near a religious shrine in Baghdad on Sunday.
Iraq’s interior ministry said following that attack that there would be heightened security across the city as they anticipated further violence.
Violence in Iraq has fallen since the sectarian killings of a few years ago, but militants still frequently attack security forces and civilians.
BBC world affairs correspondent Emily Buchanan says sectarian tensions have been simmering since the US withdrawal in December last year, and this kind of violence is exactly what they had feared.
Shia Prime Minister Nouri Maliki has been trying to consolidate Shia power at the expense of Sunni and Kurdish voices, she says.