At least 37 people died in bombings and shootings in the Iraqi capital a day after a massive blast tore through a Baghdad market, killing 130 people in the second worst attack since the March 2003 invasion.
The US military, meanwhile, revealed on Sunday that four helicopters which crashed in the past two weeks were shot down by rebels, killing 20 people in all.
In addition to the 37 people killed in Baghdad attacks, 33 corpses were found across the city and seven more people were reported killed elsewhere in Iraq.
Sunday's attacks, which followed a week of bombings in mainly Shiite areas of the capital, came ahead of a massive security operation by a combined US-Iraqi force aimed at stabilising the violence-wracked city.
In one incident a car bomb exploded near a bus station killing four people and wounding seven, and a roadside bomb left four policemen dead and four wounded.
Towards nightfall a salvo of mortar shells slammed into Baghdad's Sunni district of Adhamiyah, killing 15 people and wounding 56, a medical source said.
Iraqi security officials confirmed the attack but not the casualty figures.
The latest round of reprisals came after a massive truck bomb exploded on Saturday in the Shiite Sadiriya district of central Baghdad, killing 130 people and wounding another 305.
That attack was blamed on Sunni Arab followers of executed dictator Saddam Hussein by embattled Prime Minister Nuri al-Maliki.
Angry residents of Sadiriya vented their fury on Sunday on Iraqi leaders and security forces.