Baghdad (CNN) -- A series of attacks last month killed more than 1,000 Iraqis and injured thousands more, the United Nations said Saturday.
A total of 1,045 Iraqis were killed in May, including 963 civilians, according to the United Nations Assistance Mission for Iraq.
Those killed included police and members of security forces.
In addition to the deaths, 2,397 more Iraqis were injured, the U.N. said.
Of the total injured, 206 were members of the security forces while 2,191 were civilians.
"That is a sad record," said Martin Kobler, the top United Nations envoy to Iraq. "Iraqi political leaders must act immediately to stop this intolerable bloodshed."
Baghdad was the worst affected governorate with 532 civilians killed.
Security incidents involved improvised explosive devices and small arms fire.
The bloodshed comes amid a recent uptick in violence, much of it stemming from discord between Sunni and Shiite Muslims.
Sunni Arabs had more political clout in Iraq during Saddam Hussein's rule until his government was deposed in 2003 after the U.S.-led invasion.
Sunnis have long felt politically marginalized under a Shiite-led government in the post-Saddam era.
Iraq is seeing some of the worst violence since the civil war of 2006, but Foreign Minister Hoshyar Zebari says the country is not unraveling.
"We are worried indeed because of this increase in the number of terrorist attacks and also the rise of sectarian tension," Zebari told CNN's Christiane Amanpour in an exclusive interview last month.
"But really, the country is not sliding into civil war or sectarian war."
CNN's Mohammed Tawfeeq reported from Iraq, and Fath Karimi wrote from Atlanta