The Fiji Corrections Service says the country's anti-corruption watchdog is investigating its chief, Lieutenant Colonel Ifereimi Vasu.
The Lieutenant Colonel has confirmed that officers visited his office last week and removed files, in the latest move in a series of high-profile investigations.
The Fiji Independent Commission Against Corruption has recently charged the former vice-chancellor of the Fiji National University, Ganesh Chand, with abuse of office.
He was sacked in December.
It has also confirmed an ongoing investigation into the Health Ministry.
Leaked documents on the FijiLeaks website show that FICAC had recommended charges against the former Health Minister, Neil Sharma, more than two years ago.
Dr Sharma resigned last week but did not give any reasons.
Although FICAC says it cannot confirm an investigation into the Corrections Department, Lieutenant Colonel Ifereimi Vasu says he was told in a meeting that there was a complaint filed against him and he gave consent to FICAC to collect and remove files from his office.
He says he expects to hear from the Commission soon and is comfortable with the nature of the investigation.