The bosses of Australia's biggest supermarkets are bound for Canberra, set to appear before a Senate committee. 

Unions, farmers and the consumer watchdog spoke about the squeeze being felt across the country as whistleblower Abdel Badura blamed the grocery giants. 

"Blowing the whistle on the supermarket duopoly is the biggest risk I have taken both personally and professionally," Badura said.

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Badura spoke out as the Senate examines supermarket pricing, calling on his experience working for suppliers dealing with the big grocers, which will have their say tomorrow.

"During this time I have witnessed the tactics and practices Australia's supermarket duopoly Coles and Woolworths deploy to price gouge suppliers and ultimately customers," Badura said.

Greens Senator Nick McKim said these two days "are going to be critical for this inquiry".

"Ultimately the CEOs of Coles and Woolworths are going to need to explain," McKim said. 

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A review of the grocery code of conduct is under way.

Coles and Woolworths support making the voluntary code mandatory.

The interim review has already suggested billions of dollars in fines if sustained price gouging is found.

"Where a matter is brought to us that incorporates significant harm and systemic harm occurring, then we take action," Australian Competition and Consumer Commission deputy chair Nick Keogh said.

This is one of six inquiries currently looking at supermarkets.

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The majority of senators have called for so-called divestiture powers that could force the big supermarkets to sell if the businesses are found to be abusing their market share.

"The biggest recent divestiture was AT&T in the US and that's had a massive positive effect on jobs," former ACCC boss Allan Fels said.

Prime Minister Anthony Albanese is against the move as he is worried about the impact on competition.

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Westfield has strengthened security in its centres across Australia and New Zealand days after the mass stabbing spree at one of its locations in Sydney.

Joel Cauchi, 40, killed six and injured a dozen more inside the Bondi Junction shopping centre on Saturday afternoon before he was shot dead by a police officer.

Bondi Junction Westfield has been shut since Saturday as police worked the active crime scene but it has now been handed back, Scentre Group chief executive Elliot Rusanow said.

READ MORE: Police close crime scene at Bondi shopping centre

He said Westfield has increased its security across all 42 locations as it undertakes a review into security measures and responses at Bondi Junction on Saturday.

"Security has been increased throughout the entire portfolio in Australia and New Zealand," he said outside the centre today.

Rusanow confirmed the centre is set to reopen later this week.

"We are devastated along with the entire community and nation (at) the loss of life, the serious injuries sustained," he said at a press conference today. 

"As you can imagine, the process of reopening is one that is a challenging one … it was the centre of very tragic circumstances and we have to respect the loss of life, the victims, the victims' families." 

One of the victims, Faraz Tahir, 30, was working his first shift as a security guard at the centre when he died protecting a member of the public.

Another security guard was also injured and rushed to hospital.

Rusanow said the company is facilitating Tahir's family overseas to come to Australia.

"We as an organisation will acknowledge and remember our colleague who lost his life protecting others," he said.

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The NSW government has green-lit $18 million to fund an independent coronial inquest into the stabbing but ruled out allowing security guards to carry stun guns or other firearms.

"We don't believe that more firearms in the community is a good decision, but we're looking at the current restrictions that are in place for equipment, for security guards, and the resulting training that would be required if there was to be a policy change," Premier Chris Minns said.

"We are ensuring they have what they need. I'm not announcing an immediate policy change but we're reviewing the restrictions in place. Except in relation to firearms."

If you're struggling, know that help is available 24/7.

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Kids Helpline: Call 1800 55 1800 or chat online.

Beyond Blue: Call 1300 22 4636 or chat online.

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If you or someone you know is in immediate danger, call Triple Zero (000).

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The heartbroken parents of Joel Cauchi, the 40-year-old who killed six and injured a dozen in a stabbing spree in eastern Sydney, have spoken about their son from their family home in Toowoomba.

Cauchi, armed with a knife, was shot dead by a police officer after he carried out the mass attack at a Westfield shopping centre in Bondi Junction on Saturday afternoon.

His parents Andrew and Michele Cauchi, who have expressed their sorrow for the victims and their devastation at their son's actions, said Joel had been off medication for his mental illness.

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Talking to reporters from outside their home in Toowoomba, Michele said the attack was out of character.

"He was brought up in love, he was a loved child," she said.

"This is a parent's absolute nightmare when they have a child with mental illness, that something like this will happen.

"My heart goes out to the people our son has hurt.

"If he was in his right mind he would be absolutely devastated." 

READ MORE: Police close crime scene at Bondi shopping centre

Andrew said he has been watching through vision from inside the shopping centre trying to understand what happened.

"This is so horrendous that I can't even explain it," he said.

"I don't know why he would do this, I've done everything I can to help him.

"He's my son and I'm loving a monster. For you, he's a monster. To me, he was a very sick boy."

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Police have confirmed Cauchi was known to authorities due to his history with mental health-related issues.

He had recently moved to Sydney from Brisbane and NSW Police is working with Queensland Police in its investigations into the stabbing. 

While the motive for the attack is still unknown, NSW Police Commissioner Karen Webb yesterday confirmed whether Cauchi targeted women was an "obvious line of inquiry".

"He wanted a girlfriend and he's got no social skills and he was frustrated out of his brain," Andrew Cauci said of the theory.

The six people killed in the attack – five women and one man – have since been identified.

A dozen, including a nine-month-old baby girl, were seriously or critically injured and rushed to different hospitals around the city.

READ MORE: Condition of nine-month-old stabbing victim improves

If you're struggling, know that help is available 24/7.

Lifeline: Call 13 11 14, text 0477 13 11 14 or chat online.

Kids Helpline: Call 1800 55 1800 or chat online.

Beyond Blue: Call 1300 22 4636 or chat online.

1800RESPECT: Call 1800 737 732, text 0458 737 732 or chat online.

13 Yarn: Call 13 92 76.

MensLine Australia: Call 1300 78 99 78.

If you or someone you know is in immediate danger, call Triple Zero (000).

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