The inquiry into alleged Casey councillor corruption has been put on hold in response to coronavirus.
IBAC Commissioner Robert Redlich announced on 17 March that the Operation Sandon public hearings would be adjourned until further notice.
In a statement, he said it was a “precautionary measure in consideration of public health”.
“IBAC will make a public announcement once it is appropriate to recommence the hearings.”
The inquiry is expected to call further witnesses as well as experts in Victoria’s planning system, political donations, lobbying and governance.
Meanwhile, IBAC has closed its offices until further notice after a worker in its building tested positive to Covid-19.
Mr Redlich had closed the hearings on 15 and 16 March to the public in response to escalating health concerns, including Victoria’s declared state-of-emergency.
The proceedings were live-streamed on internet.