Violence killed at least 1,119 Iraqis and wounded 1,561 others in March, a sharp increase from the previous month, the United Nations revealed.
The UN mission to Iraq said in a statement that the figures include 575 civilians killed and another 1,196 wounded. The other casualties were Iraqi security forces, including Kurdish forces known as the peshmerga and government-allied militiamen.
The worst-hit area was the capital, Baghdad, with 259 civilians killed and 770 wounded, followed by the northern Ninevah province with 133 killed and 89 wounded.
In February, there were 670 Iraqis killed and 1,290 wounded.
The UN said it could not verify reports of large numbers of casualties from secondary effects of violence, including those who died after fleeing their homes from exposure to the elements or lack of food, water or health care.
The UN envoy to Iraq, Jan Kubis, said he's "extremely disturbed at the continuing loss of life and injury as a result of terrorism, violence and armed conflict".
"It is totally unacceptable that civilians should bear the brunt of violence," Kubis said in the statement.