The ringleader of a Christmas Day terror plot has been sentenced to more than two decades behind bars.

The Victorian Supreme Court sentenced Ibrahim Abbas to 24 years in prison after he pleaded guilty to conspiring 'in preparation for a terrorist act'.

Abbas, alongside brother Hamza Abbas, cousin Abdullah Chaarani and friend Ahmed Mohamed had planned to attack numerous landmarks in Melbourne in 2016.

The Victorian Supreme Court sentenced Ibrahim Abbas (pictured) to 24 years in prison after he pleaded guilty to conspiring 'in preparation for a terrorist act'

Abbas, alongside brother Hamza Abbas, cousin Abdullah Chaarani (pictured) and friend Ahmed Mohamed had planned to attack numerous landmarks in Melbourne in 2016

Details of Abbas' sentence were kept in the dark because of a suppression order, but that was revoked in the late afternoon on Friday.

In sentencing Abbas in September, Justice Andrew Tinney said the ringleader's crime would've shaken Australia 'to the core'.

'You went about preparing for a multi-faceted attack which would have been designed to cause maximum death and suffering and maximum trauma and distress to the community,' he said.

'It would have represented a shocking and entirely unjustified attack upon our democratic system, a system under which you were brought up and have always lived, but whose rules you so flagrantly chose to ignore.'

The Campbellfield father, alongside his accomplices, had obtained chemicals and explosive material from a Bunnings and Chemist Warehouse.

They had also downloaded bomb-making instructions from the internet, and attempt to manufacture improved explosive devices.

The group planned to detonate the bombs and use weapons with the intention of violent jihad at places like Federation Square and St Paul's Cathedral.

Abbas at one point told police he planned to strap an explosive vest to his younger brother.

Heavily-armed police arrested him at his home at 7.56pm on December 22, 2016, before the terror plot could be taken any further.

'Your timely arrest by the dedicated and expert investigators of the Joint Counter Terrorism Team was all that prevented a devastating and murderous terrorist attack in the heart of the City of Melbourne,' Justice Tinney said.

Hamza Abbas (left), Abdullah Chaarani and Ahmed Mohamed (right) had all applied to have their identities suppressed after being found guilty following a 10-week trial that would have already cost more than $1 million to run

Justice Tinney went on to say there was little proof that Abbas had shown remorse or deradicalisation during his time in custody.

Abbas identified as an atheist as a teenager but turned to Islamic radicalisation when he was 19, after his uncle's death.

He had pledged allegiance to Islamic State via Facebook in 2014.

Abbas had told police he would have fought for Islamic State if the opportunity arose.

'You harboured long-standing radical views at the time of the conspiracy,' Justice Tinney said.

'These views have no place at all in this society, or indeed, in any civilised society.

'It remains to be seen whether or not in time, those views will subside. If they do not, you will remain a danger to the community.'

The group planned to detonate the bombs and use weapons with the intention of violent jihad at places like Federation Square and St Paul's Cathedral

In his sentencing remarks, Justice Tinney quoted Abbas from a police interview, where the would-be terrorist said he was at the 'forefront' of the group.

'With regards to my brother, I was pushing him as much as I can so he could join me in this act because I was trying to create a group and he was hesitant, very, very hesitant, he did not want to do it and I was forcing it upon him...and I'd try to do whatever I can to bash my views onto him.'

Abbas said he was equally pushy with the Chaarani and Mohamed.

Hamza Abbas, Chaarani and Mohamed had all applied to have their identities suppressed after being found guilty following a 10-week trial that would have already cost more than $1 million to run.

The trio will be sentenced at a later date.