Details are being revealed about the Sydney caravan hoax - described by police as a 'fake terrorism plot'.

NSW police were given a tip-off in January about a caravan at a property in Dural, filled with explosives and a note referencing Jewish targets.

Police have now revealed it was a con job - manufactured by organised crime.

Australian correspondent Murray Olds says the police say they knew early on that it was a hoax.

"Explosives from the mining industry -  not only were they old and not designed to go off anymore, they didn't have a detonator. And they had written in crayon, from the sound of it, a list of Jewish targets in Sydney." 

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