A teenage boy is dead and another seriously injured after both were stabbed in front of witnesses at Sydney's Royal Easter Show.

A brawl broke out at the crowded carnival ride area of the showground about 8pm on Monday night, NSW Police said.

The 17-year-old suffered a critical stab wound to the chest and was given first aid at the scene by police before paramedics arrived.

He died while being transported to Westmead Hospital.

NSW Ambulance Inspector Mark Whittaker said the teen was in cardiac arrest with a traumatic chest wound when paramedics arrived.

"Paramedics performed CPR and a number of other critical interventions at the scene before loading the patient for transport to Westmead Hospital," he said in a statement.

"Unfortunately despite best efforts, he couldn't be resuscitated.

"There's no doubt this would have been a very confronting scene for the dozens of witnesses who were out to enjoy an evening at the Royal Easter Show."

A second teen, 16, was stabbed in the leg and taken to Westmead Hospital in a serious but stable condition.

A 15-year-old boy was arrested nearby and taken to Auburn Police Station.

Show patrons were moved away from the area which was packed with people and is now closed while a crime scene has been established.

Videos on social media captured parts of the incident, including footage of boys brawling in a busy area by a lit up a Ferris wheel, as groups of teenagers ran through crowds and a woman yelled, "Oh s**t".

Another video showed a teenager being led away by police.

Detectives investigating the stabbing have urged members of the public to help identify witnesses and to hand over any mobile phone footage they have of the incident.

Police will provide an update on the incident later on Tuesday.

The Royal Agricultural Society of NSW said it was shocked and saddened by the teenager's death and the "adult carnival" rides area would remain closed on Tuesday.

"The RAS does not tolerate or condone any violence or anti-social behaviour and joins with NSW Police and the wider community in condemning this appalling behaviour and unnecessary loss of life."

Meanwhile, SafeWork NSW is investigating if the Free Fall ride should be closed for the remainder of the show after a four-year-old child was left unrestrained while the ride was in operation.

A photograph on social media showed the boy sitting on the ride without a harness when it was in mid-air, while three other children on the ride were restrained.

Fair Trading Minister Eleni Petinos said she had a zero-tolerance approach towards any operator who failed to provide the highest possible safety standards.

"I can confirm that I have instructed SafeWork NSW to explore shutting the Free Fall ride for the remainder of the 2022 Sydney Royal Easter Show if patrons' safety cannot be guaranteed," Ms Petinos said.

"The ride has been closed pending investigation."

SafeWork NSW Inspectors will continue to be a presence for the remainder of the show.

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Prime Minister Scott Morrison aims to use the second day of election campaigning to focus on a jobs creation pitch.

Mr Morrison is in Sydney on Tuesday, spruiking a pledge to create 1.3 million jobs over the next five years.

Labor leader Anthony Albanese remains in Tasmania, where he will outline a plan to reinstate a 50 per cent regional loading for bulk-billed telehealth psychiatric consultations.

The commitment is expected to cost more than $31 million over four years, and support 450,000 consultations.

Mr Morrison said the coalition's new jobs pledge covered multiple sectors of the economy, citing the defence industry and, food and beverage manufacturing.

"We're going to invest in skills," he told radio station 5AA in Adelaide.

Treasurer Josh Frydenberg said employment growth would be broad based.

"Our plan is to create more jobs right across the economy by backing small business, and ensuring that businesses are free to innovate, to hire and to grow," he told Sky News.

Mr Albanese will be trying to put day one of the campaign behind him after he was unable to cite the Reserve Bank of Australia's cash interest rate or the national unemployment rate during a media conference in Launceston.

But former prime minister John Howard did not see what the fuss was about.

"Anthony Albanese didn't know the unemployment rate? So what?" he said while campaigning with cabinet minister Ken Wyatt in Western Australia.

Despite the former prime minister's sympathy, the treasurer still seized on the opposition leader's error.

"(Anthony Albanese's) getting pretty desperate if he's seeking comfort from John Howard," Mr Frydenberg said.

Mr Albanese later owned up to the gaffe, saying he was happy to "fess up" to his mistakes.

Shadow treasurer Jim Chalmers said the unemployment rate did not tell the full story.

"The defining feature of the labour market right now is that that even though we've got the unemployment rate falling in welcome ways, we're still not generating the real wages growth that we need to keep up with the skyrocketing cost of living," he told ABC radio.

"The government doesn't have a plan to deal with the skills shortages and labour shortages that come with an unemployment rate at four per cent."

It comes as a new opinion poll showed Labor maintaining its lead over the government.

The Roy Morgan poll shows Labor ahead 57-43 on two-party preferred, while Labor is also ahead in all six states.

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Anthony Albanese has sought to move on from his economic figure gaffe, saying he will shake off the incident.

While continuing to campaign in Tasmania in the Labor-held seat of Lyons, the opposition leader aimed to downplay his comments from Monday where he could not state the unemployment rate or the official interest rate.

Instead, the Labor leader moved to shift debate back towards policy, unveiling a plan to reinstate a 50 per cent regional loading for bulk-billed telehealth psychiatric consultations.

"The Labor Party is actually the only party that's released comprehensive and detailed policies around supporting economic growth and the jobs that that will create," he told reporters in northern Tasmania.

"When you make a mistake with a number, and I was concentrating on something else, it shouldn't have happened, you own up to it and move on ... I wish it hadn't had occurred, I am usually very good with numbers."

Prime Minister Scott Morrison seized on Monday's remarks during a press conference in the marginal seat of Parramatta, which is currently held by Labor by 3.5 per cent.

"Leaders will not get every single figure right, and that's not really the issue here. The issue is there's something Anthony Albanese should be apologising for, it should be that he doesn't have an economic plan," he said.

"His working assumptions about our economy and what Australians are achieving in our economy he doesn't know and he doesn't understand."

The government was using the second full day of the campaign to spruik a pledge to create 1.3 million jobs over the next five years.

However, Mr Albanese said the government could not be trusted on job predictions.

"This is a government that don't have a plan for the economy. That's why from this government what you're seeing ... support, these one-offs that disappears as soon as people have cast their vote," he said.

"(The budget) was all about an election, what we need is a plan for the economy."

It comes as a new opinion poll showed Labor maintaining its lead over the government.

The Roy Morgan poll shows Labor ahead 57-43 on two-party preferred, while Labor is also ahead in all six states.

Despite being behind in the polls, the prime minister stressed the election was not about a popularity contest.

"This is about whether people are good at managing the economy and have a strong economic plan," he said.

"You can't risk it on an inexperienced and unproven team."

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A protester who ran on to the field with a flare during an NRL match between the Cronulla Sharks and Wests Tigers in Sydney has been jailed for three months.

It was one of multiple pitch invasions during round five of the NRL season, with other spectators also running on to Cronulla's Shark Park on Sunday.

Unlike the woman crash tackled by security after running through an NRL game at Parramatta on Saturday night would later claim, Andrew George was not crossing something off his "bucket list".

The 32-year-old was "embracing the larrikin spirit ... defying authority when authority needs to be defied", he said in a statement recorded before he lit an orange flare as he ran on the field.

He pleaded guilty to two charges in Sutherland Local Court on Monday.

George was fined $440 for entering enclosed land without lawful excuse and sentenced to three months in prison for possessing a bright light distress signal in a public place.

It was the latest action from the protest group Fireproof Australia.

The group is demanding the immediate rehousing of flood and bushfire survivors, the implementation of recommendations from the royal commission into the Black Summer bushfires, and for schools, aged care and disability facilities to be made "smoke-proof".

The pitch invasion was a change in tactics for the group, which has previously blocked traffic on roads and bridges to draw attention to their cause.

NSW recently passed new laws that could see those protests result in fines up to $22,000 and up to two years in prison.

Shortly after, Fireproof Australia were back blocking roads, vowing to defy the new laws while Premier Dominic Perrottet called for courts to "throw the book" at them.

On Friday, Fireproof Australia claimed a victory, even while more protesters were being arrested, saying Mr Perrottet "agrees with our demands" to rehome people who have lost their houses in floods.

Mr Perrottet and other senior members of his government have repeatedly said housing is the priority for the NSW flood recovery since early March.

© AAP 2022