U.S. Drug Enforcement Administration agents had alleged "sex parties" with prostitutes over several years, said a report published on Thursday and stemming from a review of allegations of misconduct by several DEA agents in Colombia.

The alleged parties were funded by local drug cartels, said the report by the Justice Department's Office of the Inspector General, an agency internal watchdog.

The report raised concerns about inadequate reporting of allegations of misconduct and sexual harassment by several law enforcement agencies, including the DEA, the FBI, the U.S. Marshals Service and the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF).