New Vic anti-terror laws come into effect

Suspected terrorists can be detained without a court order for up to four days and police shoot-to-kill powers have been strengthened under new Victorian laws.

The changes prompted by the deadly Brighton siege were announced in 2017 and came into effect on Monday.

Police are now able to hold terror suspects without a court order or a warrant for up to four days and children aged 14 and over can be held for up to 36 hours, whereas previously a terrorist act had to be imminent for preventative detention to happen.

There is also a presumption against bail and parole for those deemed a terrorist risk.

Police will be able to search people, vehicles and premises and cordon off areas under tougher special powers, which will also allow protective service officers to work alongside police during an incident.

"These laws include important safeguards - such as independent oversight - and implement key recommendations of the expert panel," Attorney-General Martin Pakula said in a statement.

An expert panel led by former chief commissioner Ken Lay and retired judge David Harper last year recommended a slew of reforms after the June 2017 Brighton attack.

Terrorist Yacqub Khayre shot dead serviced apartment receptionist Nick Hao and wounded three police officers before being killed in a hail of bullets.