Reuters is reporting that an internal investigation into fraud and corruption within the United Nations has found a wide variety of possible cases.

A U.N. internal investigative unit has found an unexpected amount of fraud and abuse in some 250 cases currently underway, including alleged sexual and financial offenses.

“Our caseload has been very steady over the last three months, around 250 cases,” Inga-Britt Ahlenius, head of the U.N. Office of Internal Oversight Services (OIOS), told reporters. “We found mismanagement and fraud and corruption to an extent we didn’t really expect.”

Ahlenius said two-thirds of the cases related to peacekeeping missions. Around 80 involved possible sexual exploitation and abuse.

According to the report, up to 10 percent of the peacekeeping budget could have  involved fraudulent transactions.

 She said investigators had confirmed that contracts worth around $600 million involved fraud at some level. The total U.N. peacekeeping budget for 2007-2008 exceeds $5 billion.