A report by the Federal Bureau of Investigation's internal watchdog into the agency's handling of an inquiry into the management of emails by former U.S. presidential candidate Hilary Clinton will be released next week, the agency said on Thursday.

U.S. congressional committees are also currently investigating the FBI's handling of the inquiry in 2016.

The U.S. Justice Department's inspector general, Michael Horowitz, said in a letter that most of the process to sign off on the report and protect classified information it may contain "is now complete, and we anticipate releasing the report on June 14, 2018."