TWO of the four Western Sydney brothers attempting to join the Islamic State death cult have been described as “obese”, “unfit” and unlikely to complete the group’s terrorist training.

Muslim community leader and local GP Dr Jamal Rifi told The Daily Telegraph two of the older boys — the sons of Lebanese immigrants — weighed more than 140kg. The brothers texted their mother last week to say they had arrived in Syria seeking “paradise”, after originally telling her they were holidaying in Thailand.

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media_camera Dr Jamal Rifi.

Dr Rifi said it would not be a good look if the brothers ate the food of jihadists if they “can’t even run on the field”.

Islamic State propaganda videos released earlier this year showed prospective terrorists jumping through rings of fire and completing exhaustive drills.

“They’re definitely not fit to fight, they don’t have any knowledge of how to fight. They would be used for a propaganda video the same way as we saw with Abdullah Elmir,” Dr Rifi said, referring to the red-headed Bankstown 17-year-old who appeared in an IS video last month.

The recruitment of the four Australian brothers, aged 17, 23, 25 and 28, would likely be manipulated by IS propaganda chiefs, he said.

Dr Rifi, who is assisting the family, said the youngest boy was completing his HSC and won a principal’s award last year. The 17-year-old also travelled to Mecca with his brothers and mother two years ago on the hajj pilgrimage.

“They didn’t show any signs of radicalisation. They were good boys, which is why their mother is so shocked,’’ he said.

Dr Rifi said the boys had been brainwashed and police are believed to be attempting to track down radical associates who may have facilitated their trip to Turkey.

It is understood the father of the brothers had observed a mystery man talking with one of his sons in the front yard before they travelled overseas.

The brothers were devout Muslims who regularly attended prayers and travelled to mosques for guidance.

It has also been revealed the bungling brothers’ attempt at jihad had a farcical beginning when they missed their flight out of Australia.

It is understood Turkish government authorities have been contacted by their Australian counterparts to piece together the brothers’ movements.

The brothers — who were not on the intelligence agencies’ watchlist — had told their mother they had won a “free holiday” to Thailand.

The mother received a text last week telling her they had arrived in Bilad al-Sham — the term given to a historic Syrian-based caliphate and adopted by Islamic State.

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AUSTRALIAN intelligence and security agencies are examining chilling images of up to a dozen terrorist fighters in the act of beheading victims to identify any involvement by Australians.

The images have been posted by the Islamic State along with video of the beheading of US aid worker Peter Kassig.

However, unlike previous images in which the barbaric acts have been carried out by a hooded man, the latest pictures of mass beheadings show the identity of the murderous culprits.

Senior government sources confirmed the counterterrorism agencies were carefully examining all the latest images.

“Security agencies are aware of the footage and are examining it for any useful intelligence,” a source said.

It is believed they could not confirm yet whether any of the murderers were Australians known to have fled to the Middle East to become foreign fighters with the IS death cult.

The images are among the most gruesome yet.

The victims, reportedly Iraqi pilots and officers, are forced to the ground and then beheaded.