At least 35 people were killed and 63 wounded in a suicide bombing in a funeral gathering in northern Baghdad on Saturday, said Iraqi police and hospital officials.
The attack occurred at around lunchtime, the officials said, speaking on condition of anonymity because they were not authorised to brief the media.
There was no immediate claim of responsibility for the attack, which comes as Iraqi security forces are preparing for an operation to retake the militant-held northern city of Mosul, the country's second-largest city, from the Islamic State group.
In the past, the IS group has increased insurgent attacks inside government-held territory far from the front lines after suffering territorial losses on the battlefield.
Iraq has seen several bombings in recent months, though most have had lower death tolls than Saturday's attack. In July, a massive car bomb in central Baghdad's popular shopping district of Karradah killed about 300 people and forced the resignation of the country's interior minister.
(With inputs from AP)