A man claiming to own the Dural property linked to a counterterrorism investigation says police broke down the front door and handcuffed his tenant.

NSW Premier Chris Minns is speaking on an ongoing investigation, after police uncovered a caravan carrying items purportedly illustrating a terror plot.

More than 100 counter-terrorism officials are involved in the investigation following the discovery of the caravan.

The pair are allegedly connected to the caravan filled with explosives believed to have a potential blast zone of 40 metres, and considered to be on the periphery of a broader antisemitism terror investigation.

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A furious NSW Premier Chris Minns has vowed to lock up the "bastards" committing antisemitic attacks across Sydney. Minns lambasted the attacks as "utterly appalling and shameful", adding that he was ashamed to admit there were "terrible people" within the community.

The NSW police are continuing their investigation before charging the individual, according to Webb taking their time because the immediate threat had been averted.

The Australian Security Intelligence Organisation says it anticipated spikes in politically motivated violence months before a caravan laced with explosives, intended for Jewish targets in Sydney, was discovered by the side of the road 10 days ago.

The Australian Federal Police and ASIO are now involved in the investigation with police saying there is no ongoing threat to the public.

Australian police believe explosives found on Sydney’s outskirts were evidence of a deadly escalation in a campaign of antisemitic arson and graffiti crimes that has been waged in major cities for months.

Calls have grown for mandatory jail time after an explosives-laden caravan was discovered with anti-Semitic material, setting the stage for a political showdown.

Nationals Leader David Littleproud says New South Wales Premier Chris Minns has shown “more leadership” than the Prime Minister.