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NATO has stepped up efforts to provide security to allow an election whose outcome will be generally accepted as credible, hoping that will help stabilize the nation’s fractious politics, which are helping fuel the violence.

Yet frictions have continued to mar the relationship between the government of President Hamid Karzai and its international partners, largely over the knotty question of endemic official corruption.

On Saturday, the government criticized U.S. media reports that numerous Afghan officials allegedly had received payments from the CIA, including one who reportedly took a bribe to block a wide-ranging probe into graft.

A presidential office statement did not address or deny any specific allegations but called the reports an insult to the government and an attempt to defame people within it.

The statement came the same day as a top graft-battling Afghan prosecutor said he had been forced into retirement.

Deputy Attorney General Fazel Ahmed Faqiryar has complained that Attorney General Mohammad Ishaq Aloko and others are blocking corruption cases against high-ranking government officials. He said Mr. Aloko wrote a retirement letter for him earlier in the week and that Mr. Karzai accepted it.

Officials said Sunday that Mr. Faqiryar had been retired because he was 72, two years over the mandatory retirement age.