The website of the Victorian Human Rights Commission has been shut down, reportedly by an international hacking ring.
The Guardian Australia earlier today released an image of the website overlaid by a message purporting to be from "Anonymous", that said: "AnonPlus puts offline sites that actively contribute to the control of the masses from the corrupt".
That message has since been replaced by another reporting the site is temporarily down and the commission was working to get its site back online as soon as possible.
The commission said it was aware of the breach, but did not know what caused it.
No personal data had been compromised, the commission said.
John Pesutto, Victoria's shadow attorney-general, said it was "concerning" the website may have been hacked given longstanding requirements on public sector bodies to maintain safeguards against cyber attacks.
"If this kind of hacking can occur with such ease, then how many other Victorian government agencies are susceptible to cyber attacks, " Mr Pesutto said in a statement.
"If it was hacking, Premier Daniel Andrews must ensure a thorough, independent investigation so Victorians feel confident no further cyber attacks occured at any Victorian agency," he added.