Dual nationals will be stripped of their citizenship, Mr Abbott said in a landmark national security address

More than 30 Australians have returned home after fighting for jihadist causes overseas, review reveals

Many Australians who fight for the Islamic State will be stripped of their citizenship, the Prime Minister has announced, as part of tough new counter-terrorism laws.

The dramatic pledge came as a review released today revealed more than thirty Australians have returned home after fighting for jihadist causes overseas.

In a landmark national security address, Mr Abbott said the government will attempt to strip or suspend the citizenship of Australians with dual citizenship fighting overseas.

The government is also exploring taking away some of the rights of jihadists who are sole Australian citizens, Mr Abbott said.

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In a speech on Monday Prime Minister Tony Abbott announced new counter-terrorism measures and a National Counter-Terrorism Coordinator

Mr Abbott revealed the government is developing amendments to the Citizenship Act to take strip or suspend dual national Australian jihadists' citizenship

The government will also work to restrict the rights of jihadists with sole Australian citizenship, including restricting their access to welfare

That could include restricting their access to welfare payments, to consular help and their ability to leave or return to Australia.

'The Islam-ist death-cult has declared war on the world,' Mr Abbott said during today's announcement.

'We cannot allow bad people to use our good nature against us.'

He added that Sydney siege gunman Man Monis had been given the benefit of the doubt too many times, including with citizenship.

Mr Abbott also confirmed that ASIO is currently investigating thousands of terror leads and suspects, with 400 people deemed high risk.

'That’s more than double the number a year ago,' Mr Abbott told the assembled crowd, which included top national security officers from the Australian Federal Police.

A crackdown on so-called 'hate preachers' and the appointment of a national counter-terrorism tsar were also announced.

The public will have more information available to them about the country's current terror threat - which now sits at high - so they can better understand the system and its levels.

Today's address follows the release of government's review of Sydney's Martin Place siege on Sunday, which revealed crazed gunman Man Haron Monis 'slipped through the cracks of the system'.

The prime minister is also expected to announce an increase in funding for national security agencies, and present a more cohesive plan that would see state and national efforts brought in alignment

Mr Abbott may also reveal that another attack, like the one carried out by Man Haron Monis (pictured) is likely

On Sunday when Mr Abbott released the review, he said that a shift in the balance between individual freedoms and community safety.

'There is an ongoing and inevitable debate in a country such as ours … between the rights of the individual and the protection of the community,' he said.

'My judgment is that – while having always to respect both – the question of precisely where we draw the line in the era of terrorism will have to be reconsidered and the line may have to be redrawn.'

Despite an apparent 18 calls to ASIO in the days leading up to December 15 when Monis took 18 people hostage in the Lindt Cafe, authorities had deemed him as not a threat.

The inquiry report made a number of recommendations and Mr Abbott and NSW Premier Mike Baird said governments needed to learn lessons from the siege.

The new counter terrorism mechanisms are aimed at stopping home grown terrorists like Khaled Sharrouf (left) and Mohamed Elomar

The announcement will come a day after an review into the Sydney siege was released

'Plainly, this monster should not have been in our community,' Mr Abbott said.

'The difficulty is that while he was well and truly on a lot of radar screens, he was routinely assessed as not being a threat to himself or to the community.

'Plainly, at some stage he did become a threat. We obviously do need more checks and more scrutiny in the visa process, in the citizenship process.'

The new counter-terrorism measures set to be announced on Monday are going to deal increasingly with 'home-grown terrorists', like Australia's most wanted jihadists Mohammed Elomar and Khaled Sharrouf.

The review found that despite multiple reports to ASIO about Monis, he slipped through the cracks of the system to hold hostages for nearly 17 hours on December 15 and 16

Sharrouf and Elomar both fled Australia to join the Islamic State insurgents fighting in Syria and Iraq in 2013 and in July 2014 the Australian Federal Police issued arrest warrants for the disturbed pair.

Sharrouf flew out of Sydney in December 2013 using his brother’s passport and was soon followed by his convert wife Tara Nettleton who brought their five children to the Middle East with her.

The men gained notoriety as part of the more than 100 Australians who have joined Islamic State after they posted disturbing photos of themselves holding up decapitated heads of Syrian soldiers last year.