GENEVA – A $21.7 billion development fund backed by celebrities and hailed as an alternative to the bureaucracy of the United Nations sees as much as two-thirds of some grants eaten up by corruption, The Associated Press has learned.

Much of the money is accounted for with forged documents or improper bookkeeping, indicating it was pocketed, investigators for the Global Fund to Fight AIDS, Tuberculosis and Malaria say. Donated prescription drugs wind up being sold on the black market.

The fund’s newly reinforced inspector general’s office, which uncovered the corruption, can’t give an overall accounting because it has examined only a tiny fraction of the $10 billion that the fund has spent since its creation in 2002. But the levels of corruption in the grants they have audited so far are astonishing.

A full 67 percent of money spent on an anti-AIDS program in Mauritania was misspent, the investigators told the fund’s board of directors. So did 36 percent of the money spent on a program in Mali to fight tuberculosis and malaria, and 30 percent of grants to Djibouti.

In Zambia, where $3.5 million in spending was undocumented and one accountant pilfered $104,130, the fund decided the nation’s health ministry simply couldn’t manage the grants and put the United Nations in charge of them. The fund is trying to recover $7 million in “unsupported and ineligible costs” from the ministry.

The fund is pulling or suspending grants from nations where corruption is found, and demanding that recipients return millions of dollars of misspent money.

“The messenger is being shot to some extent,” fund spokesman Jon Liden said. “We would contend that we do not have any corruption problems that are significantly different in scale or nature to any other international financing institution.”

To date, the United States, the European Union and other major donors have pledged $21.7 billion to the fund, the dominant financier of efforts to fight the three diseases. The fund has been a darling of the power set that will hold the World Economic Forum in the Swiss mountain village of Davos this week.

It was on the sidelines of Davos that rock star Bono launched a new global brand, (Product) Red, which donates a large share of profits to the Global Fund. Other prominent backers include former U.N. Secretary-General Kofi Annan, French first lady Carla Bruni-Sarkozy and Microsoft founder Bill Gates, whose Bill and Melinda Gates Foundation gives $150 million a year.

The fund’s inspector general, John Parsons, said donors should be reassured that the fund is serious about uncovering corruption: “It should be viewed as a comparative advantage to anyone who’s thinking about putting funds in here.”

But some donors are outraged at what the investigators are turning up. Sweden, the fund’s 11th-biggest contributor, has suspended its $85 million annual donation until the fund’s problems are fixed. It held talks with fund officials in Stockholm last week.

Swedish Foreign Ministry spokesman Peter Larsson said in a statement that his country is concerned about “extensive examples of irregularities and corruption that the fund has uncovered” in nations such as Mali and Mauritania.

“For Sweden, the issues of greatest importance are risk management, combating corruption and ultimately ensuring that the funds managed by the Global Fund really do contribute to improved health,” he said.