At least 28 people have been killed and dozens wounded in a suicide attack on police distributing aid to needy families in Baghdad, officials say.
Dozens of people have been killed in two suicide bombings in Iraq.
Reports say police were handing out relief supplies to people made homeless in sectarian conflict since the 2003 US-led invasion of Iraq.
In Baghdad, a suicide bomber detonated a belt of explosives as police distributed aid to a crowd of homeless families, killing at least 28.
Violence has fallen sharply in the last year but militant insurgents continue to carry out attacks across Iraq.
Another suicide bomber attacked a group of Iranian pilgrims in the north-eastern city of Baquba killing and injuring many, reports say.
Five children were among the dead in the latest incident in Baghdad.
Violence has fallen sharply in the last year but insurgents continue to carry out attacks across Iraq.
Officials said the bomber, who was wearing an explosives belt, infiltrated the crowd of displaced families as they received supplies in a square in central Baghdad.
Police said more than 50 people were wounded.
The BBC's Jim Muir in Baghdad says it is one of the deadliest such attacks this year.
On Wednesday, the US Department of Defense's top Middle East adviser said insurgent attacks will probably increase as US forces start to leave, but there was no plan now to delay troop departures.
President Barack Obama has said the Pentagon will withdraw all but 35,000 to 50,000 troops from Iraq by the end of August 2010.
A joint security agreement requires all US troops to be out of Iraq by the end of 2011.
