The explosion of two car bombs in a Shi'ite neighborhood of Baghdad killed 45 people and wounded 110, police officials told Efe.
The massacre took place east of the Iraqi capital in Sadr City, when the two vehicles loaded with explosives blew up at a funeral attended by Shi'ite faithful.
The two cars exploded just seconds from each other, one of them with the suicide bomber in the driver's seat while the other was parked beside it.
The more than 100 people injured in the attack were taken to Baghdad hospitals to have their wounds treated.
The explosions also set ablaze and destroyed more than 20 civilian vehicles.
Iraqi security forces immediately cordoned off the area to avoid any more attacks of that kind, something that often happens in Iraq.
Earlier Saturday, at least 11 people including security agents died and five others were wounded in suicide bombings and armed attacks in districts north of the Iraqi capital, police officials told Efe.
In another deadly attack, four guards from a Rapid Intervention Forces unit were killed in an attack by four suicide bombers, who detonated consecutively the explosives strapped to their bodies, at the entrance to a building in Beiji city, Salahuddin province.
Other guards at the scene killed a fifth terrorist before he could blow himself up in the same way, officials said.
At the same time, an armed group gunned down a soldier and wounded another two in an assault on a military control post in the Yazreb area, also located in Salahuddin.
In a similar incident, a member of the pro-government militia, the Sunni Salvation Councils, was killed and another three were injured at a lookout post in the Sherkat area north of Tikrit, the capital of Salahuddin province.
The Salvation Councils cooperate with armed forces of the Iraqi government to combat al-Qaeda in predominantly Sunni provinces, for which hundreds of its members have been slain in reprisal attacks by the terrorist organization.
Violence has skyrocketed over the past few months in Iraq, where on Friday at least 18 people died and another 21 were injured by two explosive devices at a Sunni mosque in the city of Samarra, also in Salahuddin province.
On Thursday, most Iraqi leaders and political parties signed a pack of "honor and social peace" to try and end the bloodshed and sectarian violence devastating the country. EFE