The young son of an Australian jihadist has been photographed gripping the severed head of a slain Syrian soldier.
Khaled Sharrouf's son, believed to be aged seven, used both hands to hoist the decapitated head up as he posed for a chilling photo.
His proud father, one of Australia's most-wanted terrorists and a suspected war criminal, posted the photo to Twitter on August 8 with the caption: 'Thats my boy!'.
However Mr Sharrouf's brother told the Sydney Morning Herald on Monday that Australia should 'forget' about the image that has caused outrage among authorities.
'He's gone, forget about it. He's forgotten about youse. I'm sure you've seen much worse than that,' Mostafa Sharrouf said.
The extremely graphic photo - seen on Twitter by Daily Mail Australia - is believed to have been taken in the northern Syrian city of Raqqa, according to The Australian.
With an uncomfortable expression on his face and clearly struggling to grip the head in his hands, the boy stands posing in front of a fence that featured the severed heads of apparent enemies of ISIL (also known as ISIS).
Dressed in an innocent blue t-shirt, checkered shorts, sandals and a cap - the youngster looks more as if he's dressed for a holiday tour than a warzone.
Tony Abbott said photographs such as this one highlighted the 'barbaric' nature of ISIL, which he said was trying to establish a 'terrorist state' in Iraq.
'We see more and more evidence of just how barbaric this entity is,' he told ABC Radio.
'I believe there are more photographs in the newspapers in Australia today of the kind of hideous atrocities this group is capable of.'
Mr Abbott also stated the Australian government's willingness to join the humanitarian effort to supply aid to ten of thousands of Yazidi people and Christians trapped by ISIL in Iraq.
Defence Minister David Johnston told ABC radio he was 'revolted' by the images and said they revealed the need for the tough counter-terrorism laws the government announced last week.
Opposition Leader Bill Shorten condemned the photograph of the boy as a 'shocking, evil image' but said he was wary of using the photograph for political purposes and said Labor would be discussing the proposed changes to anti-terror legislation.
Mr Shorten said the key question that needed to be answered was: 'How on earth this guy got out of Australia on his brother's passport... It's shocking he’s gone through our passport system and go to where he’s gone,' he said.
Sharrouf also uploaded a photo of himself posing with the same soldier's head with the caption: 'What a head'.
Another photo shows Sharrouf posing with his three young sons dressed in identical camouflage fatigues, wielding machine guns.
One angry tweet, accompanied by a picture of Sharrouf and his children all dressed in military fatigues, reads: 'The more u hate this path you infidel aussie dogs the happier feel dieinrage when you cant affect men lie about women.'
He has also directly threatened Australian journalists and claimed 'Inshaallah soon in Aus' - which means 'God willing or if Allah wills', a clear sign he wishes to bring jihad back to Australia.
Peter Leahy, former chief of the Australian Army, said he thought the war against Islamic terrorism might continue for 100 years.
'You see something like that and you think 'poor kid'… That kid is the next generation and how many kids are being exposed to that?' he told Today.
'We really do need to be concerned about radical Islam, and can I stress I'm not talking about Islam here, I'm talking about those radicals, those terrorists, those people who subject women and children around the world to barbarity and then they put these images [online] and expose their own children to this type of thought.
'I just can't imagine what this young boy is thinking and I certainly can't imagine what his father's thinking.'
Sydney Muslim community leader Keysar Trad condemned ISIL and those working with them as 'a bunch of brutal thugs and murderers' and said they 'have nothing to do with Islam'.
Mr Trad told Today that Australian Muslim leaders have condemned the photographs of Sharrouf and his children as 'horrifying' and 'shocking' and said they were 'working very hard to stop the supply' of young Muslims to radical groups such as ISIL.
Daily Mail Australia has seen scores of gruesome and confronting pictures from the conflict - but the photo of Sharrouf's son brandishing a head is arguably the worst of them all.
Sharrouf, a former Sydney resident, is thought to be fighting with al-Qaeda off-shoot Islamic State of Iraq and the Levant.
Security agencies believe he left Australia using his brother's passport in December, and he will be arrested on terrorism-related charges if he ever returns to Australia.
His friend Mohamed Elomar, a former Australian boxer, was pictured recently grinning widely as he posed with two decapitated heads. He then appeared advice on how to access deadly explosives in Sydney.
In July, Sharrouf posted a picture of a child brandishing an assault rifle and issued a call-to-arms for other Australian Muslims to join Islamic State's bloody war in the Middle East as well as posting a photo on Twitter of a young child brandishing a rifle.
Political correspondent Graham Richardson said the pictures showed the conflict was 'different to anything we've seen before'.
'When you've got eight-year-olds brandishing heads of their father's enemies and doing it so proudly, you've got to realise how much the world has changed. This is a different world to the one we've ever faced,' he told Today.
'We're losing the propaganda war. There is the potential for thousands of kids in Sydney's Western suburbs, in particular, some in Melbourne as well to become radicalised to the point that these other idiots have become radicalised and then they become incredibly dangerous to us.
'I don't understand how any god hates this much.'
Mohamed Elomar, a former Australian boxer, was pictured recently grinning widely as he posed with two decapitated heads
Elomar, who is wanted by the Australian Federal Police for his activities in the Middle East, on Monday renewed his social media attack on his former home country on a new Twitter account after his previous one was shut down.
The 30-year-old invited wannabe jihadists in Sydney - the city where he was born - to contact him if they want to get their hands on dynamite and grenades.
'Anyone in Sydney who is after explosives (dynamite sticks, C4 sticks, orica mine sticks, grenades ) lots more. If interested DM me,' he wrote.
The appalling pictures posted by Sharrouf continue a pattern of online activity.
In the early hours of July 5, Sharrouf tweeted: 'come and be part of what we have dreamt...for decades'. It was accompanied by a picture of him decked out in army camouflage posing with a gun in front of a white BMW.
This followed Elomar, who took aim at diggers fighting in Iraq, tweeting: 'Look at the end of these Iraqi maliki dogs bunch of girls can't wait to see a Australia soldier cyring [sic] saying bakia.'
The Sydney Morning Herald reported that 'bakia' meant 'he cries' in Arabic and 'maliki' was a term used to describes the Nouri al-Maliki government, which is led by Shiites. The regime is strongly opposed to Sunni extremists who have torn through Iraq's north in the past few weeks.
Another tweet fired off from Sharrouf read: 'My (provisions) are beneath the shade of my sword. We live better than we lived in our country.'
But these uploads barely scratch the surface of the disturbing content found on Sharrouf's Twitter page.
Earlier posts contain pictures so graphic that Daily Mail Australia has chosen not to describe or publish them.
But one that can be shared is of a young child brandishing a gun and smiling with the caption: 'One of dawlas [sic] youngest members' - which was posted late May.
Dawlah is Arabic for country or state.
Other photos show Sharrouf standing in front of military vehicles as well as fundamentalist propaganda memes.