The report said: "The prime minister's office told Unami that the mortality figures contained in the report were exaggerated, although they were in fact figures compiled and provided by a government ministry.Send us your views
"It was a matter of regret that the Iraqi government did not provide Unami with access to the ministry of health's overall mortality figures for the reporting period.
"Unami emphasises again the utmost need for the Iraqi government to operate in a transparent manner and does not accept the government's suggestion that Unami used the mortality figures in an inappropriate fashion."
At a news conference on Wednesday in Baghdad to launch the latest report, Ivana Vuco, a UN human-rights officer, said: "These figures are probably the most carefully screened.
"Unofficially in follow-up meetings we were told that the government was concerned that people would misconstrue the figures to portray a grim situation."
Iraqi reaction
Al-Maliki's office hit back at the UN mission and complained that its latest report lacked credibility.
It said: "Despite the Iraqi government's full co-operation and transparency in dealing with the UN delegation in Iraq, much of the information contained in the report was not taken from credible sources," it said.
"Considering the conditions which Iraq is currently enduring, this report calls into question the credibility of the UN office in Iraq, aggravating the humanitarian situation instead of resolving it."
While being unable to provide statistics because of the government's decision, the new report for the first quarter of 2007 said violence remained a serious problem in Iraq, despite a US and Iraqi security operation.
Sectarian violence
The Unami report said: "In February and March, sectarian violence claimed the lives of large numbers of civilians, including women and children, in both Shia and Sunni neighbourhoods.
"While government officials claimed an initial drop in the number of killings in the latter half of February following the launch of the Baghdad security plan, the number of reported casualties rose again in March."
Iraqi and US officials insist the civilian death toll from Iraq's sectarian war has declined since the plan began on February 14, but refuse to release detailed figures to back up the assertion.
Unami said that "violent deaths were a regular feature of several other cities in the governorates of Nineveh, Salaheddin, Diyala and Babel" and not just Baghdad, the centre of the bloodshed.
Potential for abuse
The Baghdad security plan seeks to quell the violence but Vuco said it also had increased the potential for the abuse of detainees' human rights.
"The disappearance of detainees still continues," she said.
"We have serious concerns that not all detainees are being registered. We found people looking for detained family members who they were unable to locate."
Most of these detainees are held for "prolonged periods of time without charge in overcrowded conditions," she said.
At least 37,641 people were being held in detention centres across Iraq as of end of March, Unami said, adding of these about 3,000 were detained since the Baghdad crackdown began.
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