Four bombs killed at least 32 people and wounded dozens in busy districts of Baghdad on Sunday.
A car bomb exploded in a parking lot in central Baghdad's busy Karrada shopping district, followed by a roadside bomb nearby, killing 19 people.
Earlier, a bomb exploded in a parked car in Baghdad's Shurta neighbourhood in the early evening, killing at least 12 people, police said.
At about the same time a bomb attached to a car in the nearby Hay al-Amil neighbourhood killed one person.
US military officials say violence in Iraq is at four-year lows but that some militant groups have stepped up attacks for the holy month of Ramadan, when Muslims observe a daytime fast.
Streets crowded with Iraqis shopping for food before they break their fast are a target for bombers.
A six-day public holiday begins on Tuesday to celebrate the end of the holy month. The streets of Karrada had been jammed with shoppers buying clothes and gifts.
