A man who was seriously injured in a shooting outside a Melbourne shopping centre over the weekend has been released from hospital.

Eric Catanese, 28, was sitting next to Robert Issa, 27, in a white Mercedes outside Craigieburn Central when four masked men approached the car on Saturday.

Multiple shots were fired, hitting both men inside the car, and killing Issa.

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Catanese was rushed to hospital in a serious condition, where he remained until Monday.

The 28-year-old's mother has told 9News that her son is a "good kid" who works hard.

Police believe four men fled in a black Range Rover Sport, which was later found torched in Westmeadows, about 12 kilometres away.

READ MORE: Rabbi walking with young child on Melbourne street confronted with alleged antisemitic threats

The men wearing balaclavas then hopped into a blue Toyota Corolla, which was then dumped in Reservoir near Merri Creek.

Police are continuing to investigate.

A two-metre shark has caused panic at Manly Beach, forcing beachgoers out of the water twice before it brought at end to swimming for the day.

A member of the public alerted lifeguards that a shark was swimming near the shore before the shark alarm was activated and all swimmers were called out of the water.

Lifeguards then searched for the two-metre grey nurse shark for an hour before declaring it safe for people to enter the water, only to set the alarm off again minutes later.

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"A member of the public spotted it again, so we went back into close mode," Beach Saftey Councillor Clinton Rose said.

Lifeguards closed the beach for the rest of the day as a precaution.

Grey nurse sharks are not considered aggressive, but they can bite people if provoked.

Experts say a close encounter with one of these sharks is rare. 

"It was just doing laps up and down the beach … chasing whiting or salmon, trying to feed," Marine Life ranger David Baxter said.

Police are continuing to search for two other offenders involved in the crimes.

Police are investigating reports antisemitic threats have been made towards members of Melbourne's Jewish community in multiple different instances.

Rabbi Daniel Rabin was walking to a synagogue in Caulfield with his eight-year-old son when he was confronted by a car of people.

Rabin has told 9News the group of people inside the car made violent antisemitic threats towards him.

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"A car stopped and we were a little anxious. The windows rolled down and there were four people in there and shouted terrible things," he said.

"My son looked at me in complete shock."

It comes as police investigate a separate incident overnight, where antisemitic threats were allegedly made towards a man walking in South Yarra.

The man was on Toorak Road near Williams Road about 4pm yesterday when a car pulled over and the occupants wound down a window and shouted threats, police have said.

Audio of the alleged incident has been circulating on social media.

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Detectives have confirmed they have resolved the incident.

"Police have spoken to the parties involved and after a thorough investigation, the matter has been determined to the satisfaction of the reporting person," a Victoria Police spokesperson said.

"Victoria Police is committed to investigating any antisemitic or hate-based behaviour or incidents of this nature and stress there is absolutely no place in our society for such acts."

The incidents follow the shock attack on Israel by Islamist group Hamas heightened racial tensions around the world.

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More than 1000 Israelis have now died in the conflict, while air strikes on Gaza have killed around 800 people, including many women and children.

The incident has fueled growing fears within Melbourne's Jewish community that they could be targeted.

Chief Commissioner Shane Patton earlier told 3AW's Neil Mitchell officers would continue to work with the Jewish community to make them feel safe.

"We have put in place immediate (police) tasking across the state to make sure we (are) patrolling where there are large members of the Jewish community," Chief Commissioner Shane Patton told 3AW's Neil Mitchell.

"Members are expected to walk around and check the school's vicinity."

Some parents have said they are keeping their children home from school due to fears of being targeted.

Hundreds of pro-Palestine protesters gathered by the steps of the State Library Victoria in Melbourne late yesterday, with a group of students seen waving Palestinian flags, calling for "freedom and justice for Palestine".

Prime Minister Anthony Albanese has announced the federal government will commence repatriation flights out of Israel for Australians who wish to leave but do not have a commercial flight booked.

Two flights have been organised with the assistance of Qantas, with the potential for more to follow.

The first will leave on Friday, and they will be free of charge for Australian citizens.

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"We understand that many Australians are experiencing difficulties with delays and cancellations with commercial flights," Albanese said.

"For Australians who do not already have plans to leave through commercial options, Australian government-assisted departure flights will depart from Friday."

The government-assisted Qantas flights will depart for London from Ben Gurion Airport, Israel's main international airport on the outskirts of Lod, not far from Tel Aviv.

Albanese said any Australian citizens wanting to leave Israel on the flights needed to register with the government's 24-hour consular emergency centre.

The centre can be called from overseas, including Israel, on +61 2 6261 3305, or on 1300 555 135 from within Australia.

"We are assessing all options to get Australians home as soon as possible who wish to travel back here," Albanese said.

"We have been working on these contingencies over recent times and will continue to do so across the range of issues as a result of the appalling and abhorrent attacks by Hamas that we saw on the weekend."

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Albanese said the government remains unsure of exactly how many Australians have been caught up in the conflict.

"Part of the issue, of course, is there are so many Australians in the area that it is not completely clear how many are there, let alone how many are unaccounted for," he said.

"So what we're doing is working through these issues."

Around 10,000 Australians are believed to be either living or holidaying in Israel.

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Australian journalist Cheng Lei has arrived in Australia after spending more than three years in detention in China.

Prime Minister Anthony Albanese told reporters Cheng was "elated" to be back home and was met at the airport by Foreign Minister Penny Wong earlier today.

"I was able to have a conversation with an Australian citizen, Cheng Lei, who has arrived safely here in Melbourne and has been reunited with her two children and her family," Albanese said.

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"Her return brings an end to a very difficult few years for Ms Cheng and her family.

"The government has been seeking this for a long period of time and her return will be warmly welcomed not just by her family and friends but by all Australians.

"Our focus remains on her interests and welfare and we are asking for her privacy and that of her family be respected at this time as she adjusts to what has obviously been a very difficult and traumatic period for her in her life."

Lei, a business anchor for China's state broadcaster CGTN and mother of two, was accused of illegally supplying state secrets, which she denied.

She was detained over the charges in August 2020.

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Albanese said the Australian government had been seeking Cheng's return since she was detained.

"We know that this has been the subject of ongoing discussions between the Australian and Chinese governments and we have continued to make representations on behalf of Australian citizens," he said.

"Her matter was concluded through the legal processes in China.

"This is something that we have advocated for for a long period of time and I think that's certainly I pay tribute to all who have made representations."

The couple used the funds to develop a significant property portfolio.

The twins had his surname and he was named on their birth certificate.