Like something out of the 18th century, the heads were left on show in a sickening display that aims to cause terror and fear.
The photos were uploaded by terrorist Khaled Sharrouf, alongside disgusting tweets such as 'bucket full of heads any1 in aus want some organs please dont be shy to ask I would love to assist u with body parts [sic]'.
His disturbing rant continued 'few more heads how lovely bludy amazing stuff abuhafs u keep cutting those infidel throats but the last 1 is mine! [sic]'
These threatening tweets are part of a more disturbing picture of Sharrouf painted by his Twitter account.
Director General of Security and ASIO chief David Irvine added a majority of the 60 Australians they were aware of fighting with Islamic radicals were siding against the government with Al-Qaeda off-shoots.
'We have some tens of people that have already returned [from the Middle East], we have probably another 150 we're looking at here in Australia who have inclinations to support those two extremist movements,' he said.
When asked if the ones who had returned to Australia were being actively monitored, Mr Irvine said 'I'm not saying anything further'.