A video widely circulated on social media shows Damien Guerot holding a shopping centre bollard up to try and stop the knife-wielding Cauchi in his tracks during Saturday afternoon's Bondi Junction shopping center attack.

Damien Guerot then chased behind NSW Police Inspector Amy Scott, who subsequently shot the attacker dead, holding a chair as a potential weapon.

During an interview, Mr Guerot told Channel Seven he is on a work visa which is due to expire in a couple of months.

Mr Albanese said earlier on Tuesday that Mr Guerot was welcome to stay in Australia.

"I say this to Damien Guerot, who is dealing with his visa applications, that you are welcome here," Anthony Albanese said.

"You are welcome to stay for as long as you like."

Opposition Leader Peter Dutton said he supports the prime minister's "generous offer".

"He embodies the Anzac spirit, and we would want people of that character in our country," Mr Dutton said.

A petition was set up by a member of the public calling for him to be granted an Australian citizenship, describing his actions as a "true act of Australianism".

"It says a lot about the nature of humanity at a time when we are facing difficult issues that someone who's not a citizen of this country stood bravely at the top of those escalators and stopped this perpetrator from getting onto another floor and potentially inflicting further carnage," Mr Albanese said.

In a statement, Minister for Immigration Andrew Giles said Mr Guerot's "extraordinary bravery is an example of the character we all want to see in our society".

"I am aware of Mr Guerot's case and have asked my department to look into visa options for him," he said.

"We thank Mr Guerot as well as other members of the public, our heroic police officers and first responders who have helped protect others from danger."

During the attack, six people were murdered and a dozen more were badly injured.

Six patients remain in hospital, including a nine-month-old girl.

Thousands of people ran for their lives or hid in shops and fire exits.

Mr Guerot, a construction worker who was on his way to the gym, ran towards the danger.

In vision of the incident he can be seen holding the bollard to protect himself from Cauchi and trying to throw it at him to bring an end to the attack.

Riess Tudela watched it happen from above.

"I saw an extremely brave gentleman trying to fend this man off the escalators, and he's just an absolute hero," Mr Tudela told 7.30.

Mr Guerot told Channel Seven he and his friend Silas Despreaux were acting on adrenaline.

"I don't know, we just thought we needed to do something to catch him," Mr Guerot said.

"You cannot think in that moment, it's just adrenaline."

He recalled "the attacker's eyes were like empty eyes … he wasn't there".

Mr Guerot said the attacker could not be held up for long and praised the actions of Inspector Scott who ran after the attacker and told him to drop the knife.

When he lunged at her she fired three shots, killing him.

Mr Albanese thanked Mr Guerot for his "extraordinary bravery".

He went as far as saying he is the type of person he would welcome as an Australian citizen but admitted "that would of course be a loss for France".

"On Saturday we saw some of the best of human character at the same time we saw such devastating tragedy," Mr Albanese said.

Original Story By | Xanthe Gregory & Keira Proust