Bourke contended.

'The Crown cannot say precisely when the act was to be carried out or who the particular target was,' he said.

As well as the bayonets, the teenagers allegedly purchased two hunting knives on October 6, with one telling the gun shop assistant they were going pig hunting.

This was of 'some significance' because when the older boy was arrested he spoke to some police saying 'pigs, cowards' and 'they were going to burn in hellfire', Mr Bourke said.

The boys were arrested (pictured) after they allegedly purchased bayonets from a Sydney gun store

'The Crown and police cannot say what happened to those knives as they were not located.'

He listed a string of items accessed by the teenagers on their phones or computers before their arrest.

The eldest boy, by months,had material including an image saying: 'I am a warrior of Islam and my path is Jihad' and a comment about a man of Islamic faith described as an unbeliever because he had become a police officer.

He also allegedly accessed advice on the sort of weapon to use when carrying out a terrorist act.

The teenagers accused of planning a terrorist attack were allegedly in joint possession of two M9 bayonets (pictured, stock)

At the age of 12, he was filmed in Sydney's Hyde Park at a protest against a satirical movie about the prophet Muhammad, Mr Bourke said.

His co-accused also allegedly had similar material on his devices and in 2015 went on a holiday to Egypt with his family, during which he left his parents and visited a place