Iraqi authorities say nearly 20 people have been killed in separate bombings Monday.
Police say three car bombs and a mortar attack in different parts of the northern city of Kirkuk killed at least 12 people and wounded more than 35 others.
Earlier, a bomb exploded at a Shi'ite mosque in central Baghdad. Police say five people were killed and 15 others wounded.
Authorities also say a man's body was found today south of the capital in the town of Mahaweel.
Meanwhile, a new public opinion poll indicates people in Iraq are increasingly pessimistic about the future of their country, four years after the U.S.-led invasion.
According to the survey, nearly nine in 10 (86 percent) people in Iraq believe they, or someone in their household, will be the victim of violence.
Only about one in five (18 percent) Iraqis have confidence in U.S.-led coalition troops, while just under half (49 percent) say they have faith in the Iraqi government.
A BBC poll two years ago indicated 71 percent of Iraqis thought things were good in their lives, and nearly two-thirds (64 percent) said conditions in the country would improve in 12 months.
More than two-thousand people from all 18 Iraqi provinces took part in the new poll commissioned by the newspaper "USA Today," U.S. broadcaster ABC news, Germany's ARD television network and the BBC in Britain.
Tuesday marks the fourth anniversary of the start of the Iraq war.
Some information for this report was provided by AFP, AP and Reuters.