Authorities are investigating whether radical Perth preacher Junaid Thorne was allowed to deliver a lecture to inmates at Hakea Prison last month.
After _The Weekend West _revealed the self-styled Sheikh labelled Christians and Jews as "filthy rapists" , Foreign Affairs Minister Julie Bishop confirmed that his video statements were being investigated.
And the State Government is investigating whether Junaid was given access to WA's maximum-security prison to deliver an Islamic sermon or "khutbah".
In a Facebook post, Junaid said he had been cleared to deliver the sermon, and hoped for "the release (from) captivity of all our brothers and sisters in all parts of the world".
The Department of Corrective Services confirmed it was "aware of Thorne and his Facebook activity".
A spokesman for Corrective Services Minister Joe Francis said he was seeking urgent confirmation whether Junaid had been allowed access to Hakea.
Days after Prime Minister Tony Abbott vowed to crack down on young Australians fighting in Syria and Iraq, Ms Bishop confirmed Junaid's preachings were being looked at.
"Any promotion or support for terrorism is against the law in our country," she said. And "ISIS is a proscribed terrorist organisation."
In a written response to the article in _The _ _Weekend West, _ Junaid said he was "not associated with any terrorist groups such as ISIS".
However, his Twitter account still bore pictures of balaclava-clad fighters under the monochrome flag adopted by Islamic State in Iraq and Syria, also known as ISIL, the Islamic State in Iraq and the Levant.
"If we are to point fingers at a group who fills the position of being a terrorist group, we can include governments such as Australia and America who practise legalised terrorism by oppressing, bombing, and killing our Muslim people ," Junaid said.
"Any oppression towards Muslims must be defended."
The 24-year-old came to prominence after he was deported from Saudi Arabia. His elder brother Shayden was jailed in Saudi Arabia for 4 1/2 years on charges of plotting a terrorist attack.
This month Shayden posted on his Facebook page about his continuing disgust at his treatment.
"The Australian Government did nothing whatsoever for me while I was in prison, and will not do anything for any Muslim prisoner," he wrote. "Then they expect us to do their dirty work.
"Well don't expect me to do any work for you. You can all go to hell."