11/09/2016 4:23 PM AEST | Updated 11/09/2016 6:23 PM AEST

Turnbull Addresses National Security Concerns On The Anniversary Of 9/11

He says we have to change the way we respond to terrorism.

Malcolm Turnbull says the nature of terrorism is changing.

Prime Minister Malcolm Turnbull has addressed national security concerns, after a 22-year-old man was charged with committing a terrorist act following an alleged stabbing in Sydney's west on Saturday afternoon.

He spoke on the 15th anniversary of the September 11 attacks on the World Trade Centre, comparing the two and addressing the changing face of terrorism.

Turnbull said the two events were not only connected by violent Islamist ideologies but also by the heroism of first responders at the scene.

"Connecting them both is a violent Islamist ideology, which perverts the religion of Islam and seeks to destroy and threaten our way of life."

He said that terrorism is changing and that our response needs to change as well.

Turnbull confirmed that new counter-terrorism legislation is to be introduced to parliament this week.

Attorney-General George Brandis said that two pieces of anti-terror legislation will be introduced to toughen up existing laws on control orders and post-sentence detention.

He also acknowledged the heroism of the first responders at the attack in Minto, that has left the victim in a serious condition.

"They acted heroically and we should all be in their debt," he told reporters in Brisbane.

Turnbull also explained that at this point, there's no plans to change Australia's terror threat level following yesterday's attack.