All swim sites in the areas have been flagged by officials as unsafe to use.

Sailors battling it out in the Rolex Sydney Hobart Yacht Race performed a special honour to the 15 people killed in the Bondi shooting.

All 129 yachts were set to scatter rose petals off the stern of their boats as they passed Bondi Beach south of Sydney Harbour.

One retired before the race started.

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The tribute was outlined during the Compulsory Race Briefing by Cruising Yacht Club of Australia Commodore, Sam Haynes, organisers said.

"The tribute that we mentioned for the tragic events in Bondi has been very well received by the Jewish community, but also internationally recognised worldwide, and obviously here in Australia," Haynes told the assembled fleet.

He said Mr Roses supplied petals for crews.

"For many competitors, the moment will provide a pause for reflection early in a race more commonly associated with speed, rivalry and endurance," organisers said.

"Just hours after the start, as spinnakers are hoisted and the fleet accelerates south, the scattering of petals will briefly shift attention away from tactics and weather to remembrance and solidarity."

It's the 80th year of the Boxing Day race, which sees crews battle it out over 628 nautical miles from Sydney in NSW to Hobart in Tasmania.

The race started just after 1pm.

Sailors have been placed on high alert, with officials warning of likely injuries during what is predicted to be a treacherous first night at sea.

Someone in Adelaide has ended their year $20 million richer and may not know it yet after hitting the jackpot in last night's Powerball draw.

The mystery ticketholder holds the only division one winning entry in last night's Christmas Day Powerball draw across Australia.

The lottery prize is the equal largest in South Australia this year.

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Officials from The Lott are still waiting for the ticketholder to check their ticket and come forward.

The winning entry was purchased at Colonnades Lotto Kiosk on Beach Road at the Noarlunga Centre.

The Lott spokesperson Matt Hart said he hopes the winner comes forward and collects their winnings soon.

"Our elusive winner is likely oblivious to the fact they became a multi-millionaire on Christmas Day," he said.

"We're encouraging anyone who purchased a Powerball ticket from Colannades Lotto Kiosk to check their tickets today.

"Just imagine how exhilarating it would be to discover you won a prize of this magnitude on Christmas Day.

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"Your plans for the New Year and beyond could be upgraded instantly!

"Make sure you check your tickets, and if you discover you are holding the winning ticket, contact The Lott on 131 868 to begin the prize claim process."

The winning numbers in Powerball draw 1545 were 7, 23, 29, 20, 11, 16 and 17.

The all-important Powerball number was 17.

The only division one winning entry in Powerball draw 1545 was the ticket from South Australia.

The Lott's division one winning tally has now reached 419 so far this year, including 36 won by South Australia Lotteries customers.

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Three kayakers and two paddle boarders have been rescued from waters across Victoria's coastline in three separate incidents on Christmas Day.

Police were first called to Corinella jetty, near French Island, off the Mornington Peninsula following reports three kayakers were in trouble about 2.10pm.

A mother and her two teenage daughters were trying to retrieve an adrift kayak when the current and strong winds swept them into Western Port Bay, police said.

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The women, who were all wearing life jackets, ended up in the water about a kilometre from the shoreline.

They were winched to safety by the Westpac Rescue Helicopter after police spotted them in the water.

Around 3pm crews were called to Lake King in Paynesville, East Gippsland to help another kayaker in trouble.

Witnesses said they saw a 41-year-old man struggling before his kayak rolled, hours earlier.

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The Air Wing spotted the Hoppers Crossing man and dropped a smoke marker highlighting his location, where he was picked up by the coast guard.

He was returned to shore unharmed.

On the other side of the state, police were called to a caravan park jetty in Port Arlington around 3pm, where a pair of paddleboarders had set out two hours earlier.

A family member called Triple-Zero after the 51-year-old woman and 17-year-old boy failed to return.

A search was launched with local police units, Air Wing, Life Saving Victoria and Queenscliff Coast Guards all trying to find them.

Air Wing officers spotted them lying on their boards and waving near Wyndham Harbour about 6.20pm, more than 10 kilometres from where they set off.

The pair were cold and exhausted but otherwise uninjured.

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NSW Police warned they will have "zero tolerance" for anyone threatening to protest ahead of a planned "bashing day" at the place where race-fuelled riots happened 20 years ago.

Alleged organiser Ryder Roy Shaw, 20, is facing court over a "violent call to action" for protesters to rally at Cronulla Beach, south of Sydney, after the December 14 terror attack at Bondi Beach.

Police say they are aware of tomorrow's plan and reminded the public that unauthorised gatherings are restricted under new state laws that were rushed through this week.

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Acting Assistant Commissioner Brendan Gorman said police will have no tolerance.

"Everyone in NSW deserves to be safe and feel safe," he said.

"Now is not the time for any behaviour that will cause division in our community."

Officers will be patrolling the beach to respond to anyone who incites violence or hatred, commits violent offences, or participates in anti-social behaviour, harassment or intimidation, he said.

"Action will be taken against anyone who engages in criminal activity that is motivated by hate," Gorman said.

READ MORE: Sydney to Hobart crews pay tribute to Bondi victims by scattering rose petals

The new law allows Police Commissioner Mal Lanyon to make a declaration restricting unauthorised public gatherings for 14 days following a terrorism incident.

His declaration started on Wednesday and will remain in place until January 7.

Police can issue move-on directions and force people to remove face coverings.

Premier Chris Minns told reporters this week that anyone seeking to stir racial hatred, violence or division in the community would be met by police.

"There is zero tolerance for it right now," he said.

Anyone who is a victim or witness hate crime is urged to contact CrimeStoppers.

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Their celebration was shared with some 15,000 racegoers at Ellerslie today.

The earlier 4.7 quake at 7.16am was felt from Wellington to Whanganui.

Police have released details of a man they believe may be able to assist with their investigation after a car adorned with Hanukkah decorations was torched in Melbourne on Christmas morning.

A Rabbi's car displaying a Happy Hanukkah sign was firebombed in his driveway on Balaclava Road in St Kilda East about 2.50 yesterday morning.

A woman and three children were evacuated from the house after the car erupted into flames just metres from their bedroom.

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Following investigations, police have released an image of 47-year-old John Argento, urging him or anyone who knows his whereabouts to contact them.

Argento is known to police and has an outstanding warrant related to deception offending.

"He  is wanted on a warrant at this stage for [allegedly] using a stolen credit card,"

"We will allege he may have been involved in other property offences as well, so stealing from cars."

Police suspect Argento may be connected to the damage of a car that was broken into in a nearby street about 20 minutes after the arson attack.

Detectives believe he frequents Melbourne's inner southern suburbs, including St Kilda, St Kilda East and Caulfield, as well as the northern suburbs.

He moves around frequently and doesn't appear to have a permanent address at the moment, police said.

He is about 185 cm tall, has a thin build, blue eyes, grey hair and a fair complexion.

"If you see him, contact Triple-Zero and someone will be sent around," Southern Metro Region Assistant Commissioner Chris Gilbert said.

Detectives believe the suspected arson attack was targeted, but said he does not pose a specific risk to the Jewish community.

"We understand the devastating impact this type of offence has on our Jewish community, and we are continuing to prioritise this investigation. We won't fully understand the motives of this arsonist until we get them into custody

"At this stage, we do not believe there is a broader threat to the Jewish community. We want to thank people in the area for their assistance in this investigation so far."

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Despite a thorough search overnight including operation Trinity units, Public Order Response team and uniform police, they have been unable to locate the suspect.

The vehicle will be forensically analysed by an arson chemist.

The home belongs to a well-known local Rabbi, who is in New York with one of the couple's children.

He is now scrambling to get home to be with his shaken family.

"There is no doubt that they are a family who's now in fear," Gilbert said.

"I've had some of my senior team go and meet with them today to reassure them that their safety is well and truly in our thoughts."

Officers will be patrolling the area and providing public reassurance.

"We have a lot of staff that are currently working here in the area and right across the state today in terms of public safety," Gilbert said.

"We are here in numbers, we're here to support [the Jewish community] we're here all day and night."

Shadow Housing Minister for Victoria, David Southwick, called for a recall of parliament.

"The community is absolutely on edge. This is the last thing we'd want coming off the Bondi attack," Southwick said.

"Its time to recall parliament – the premier's been talking really tough about a whole lot of things, well now, we need action."

The incident comes just weeks after the Bondi terrorist attack, and also a year after a synagogue in nearby St. Kilda was a fire bomb, and the wake of the October 7 terror attack in Israel.

Anyone who witnessed the incident, has dashcam/CCTV footage or information is urged to contact Crime Stoppers on 1800 333 000 or submit an online confidential report at www.crimestoppersvic.com.au

Opunake surf lifeguard credited with being part of two Christmas Day rescues.