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A 2.7-tonne iceberg has been suspended over Sydney Harbour, just metres from the foot of the Opera House in a stark piece of commentary on climate change.

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READ MORE: Novak Djokovic has visa cancelled just days before Australian Open

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Serbian tennis star Novak Djokovic had his visa cancelled tonight by Immigration Minister Alex Hawke just days before the Australian Open is due to begin.

His visa to enter the country was granted back on November 18 but the saga surrounding his arrival and vaccination status has been escalating in recent weeks.

The world number one announced in an Instagram post last week he had been granted an exemption to travel to Australia, but was detained on arrival in Melbourne just before midnight on January 5.

LIVE UPDATES: Tennis world reacts to Novac Djokovic's visa cancellation

READ MORE: Novak Djokovic has visa cancelled just days before Australian Open

He spent the night in immigration detention and was interviewed before his visa was cancelled.

On January 10, the Federal Circuit and Family Court of Australia ruled Djokovic's visa was unreasonably cancelled, and ordered him to be released from detention.

At the same time, details were emerging about his movements in Europe before he landed in Melbourne.

Djokovic tested positive to COVID-19 while in Serbia on December 16. He later took part in a photoshoot and interview with French publication L'Equipe.

FULL STATEMENT: Why Novak Djokovic's visa was cancelled

The star later said he did not know he had COVID-19 when he went to two events — the unveiling of a Djokovic stamp and a tennis awards ceremony attended by children.

But he did acknowledge he was knowingly positive while attending the interview with the French magazine, which he issued an apology for on January 12.

Tonight, Immigration Minister Alex Hawke used his ministerial powers to cancel Djokovic's visa, saying the decision was made "in the public interest".

Novak Djokovic's visa has been cancelled "in the public interest" just days before the Australian Open tournament is set to begin.

Immigration Minister Alex Hawke has announced his decision just before 6pm on Friday.

"Today I exercised my power under section 133C(3) of the Migration Act to cancel the visa held by Mr Novak Djokovic on health and good order grounds, on the basis that it was in the public interest to do so," he said by written statement.

"In making this decision, I carefully considered information provided to me by the Department of Home Affairs, the Australian Border Force and Mr Djokovic.

"The Morrison Government is firmly committed to protecting Australia's borders, particularly in relation to the COVID-19 pandemic."

LIVE UPDATES: Reaction after Novak Djokovic has visa cancelled

A statement is yet to be made by Djokovic or his lawyers, with the tennis star having the ability to appeal the cancellation.

He is, however, expected to appeal the decision. A report in the Sydney Morning Herald yesterday cited a source close to Djokovic saying the Serb's legal team would "immediately take an adverse decision by Immigration Minister Alex Hawke to court".

Prime Minister Scott Morrison issued a statement on Friday evening addressing Mr Hawke's decision, saying it was made to protect the "sacrifices" of Australians.

"Australians have made many sacrifices during this pandemic, and they rightly expect the result of those sacrifices to be protected," the statement read.

"This is what the Minister is doing in taking this action today."

TIMELINE: Novak Djokovic's tumultuous trip to Melbourne for the Australian Open

It is possible Djokovic will not be able to return to Australia for three years following the decision, as Judge Kelly confirmed in court on Monday when the possibility of the minister cancelling Djokovic's visa was raised that such a ban could occur. However, the Australian Government could use its discretion to not apply that ban to the tennis star.

Djokovic was included in the Australian Open draw yesterday after no decision to allow or cancel his visa was made on Thursday.

The world has been waiting to hear if the minister would use his powers to cancel Djokovic's visa after an initial cancellation of the men's world number one's visa was overturned in court on Monday.

Djokovic was detained by the Australian Border Force on his arrival in Melbourne last week, on the grounds that he did not qualify for a medical exemption from COVID-19 vaccine requirements.

Independent Tasmania Senator Jacqui Lambie this morning called for an end to the long wait.

"Why does this keep dripping out of the tap? Why hasn't the minister done anything about this?" Senator Lambie said on Today.

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"If he's going to do him on character, because they believe that his submission has been lied on, then, you know, this is what we do when our kids play up at school. They get sent home.

"So maybe it's about time to stop this debacle, finish it once and for all without the tap keep dripping and make up your mind."

She asked why Immigration Minister Alex Hawke was "missing in action".

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"If you can't make a decision on Novak Djokovic, goodness me, how are you guys running the country? This is an absolute shambles," she said.

"Let alone what it's making us look like to the rest of the world. It's absolutely a shocker."

Former Australian tennis star Sam Groth said the Djokovic situation was frustrating his fellow players.

"A lot of the players made the decision to get vaccinated, whether they wanted to or didn't, to be able to come and play in the Australian Open," he told Today.

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"A lot of the players who made that decision just to be able to come down to Melbourne Park feel like it is one rule for Novak and one rule for everyone else."

The Border Force is investigating whether Djokovic provided false information on his travel declaration.

The saga initially sparked a massive outcry in Djokovic's native Serbia, with his family leading rallies in the streets, while in Melbourne, crowds gathered outside the hotel Djokovic was temporarily confined to over the weekend.

But that ardour has cooled somewhat after Djokovic admitted to breaking COVID-19 isolation rules in Serbia, an offence which could reportedly net him prison time.

Immigration Minister Alex Hawke has used his "discretionary powers" to cancel tennis world No.1 Novak Djokovic's visa.

In a statement released this evening, Mr Hawke said he had cancelled Mr Djokovic's visa on the grounds of "health and good order".

Prime Minister Scott Morrison has also released a statement saying the decision was in the context of sacrifices made by Australians during the pandemic, "and they rightly expect the result of those sacrifices to be protected".

Read the full statements below.

LIVE UPDATES: Full coverage and reaction to Novak Djokovic visa cancellation

FULL STATEMENT FROM IMMIGRATION MINISTER ALEX HAWKE

Today I exercised my power under section 133C(3) of the Migration Act to cancel the visa held by Mr Novak Djokovic on health and good order grounds, on the basis that it was in the public interest to do so.

This decision followed orders by the Federal Circuit and Family Court on 10 January 2022, quashing a prior cancellation decision on procedural fairness grounds.

In making this decision, I carefully considered information provided to me by the Department of Home Affairs, the Australian Border Force and Mr Djokovic.

The Morrison Government is firmly committed to protecting Australia's borders, particularly in relation to the COVID-19 pandemic.

I thank the officers of the Department of Home Affairs and the Australian Border Force who work every day to serve Australia's interests in increasingly challenging operational environments.

FULL STATEMENT FROM PRIME MINISTER SCOTT MORRISON

I note the Minister for Immigration's decision in relation to Mr Novak Djokovic's visa.

I understand that following careful consideration, action has been taken by the Minister to cancel Mr Djokovic's visa held on health and good order grounds, on the basis that it was in the public interest to do so.

This pandemic has been incredibly difficult for every Australian but we have stuck together and saved lives and livelihoods.

Together we have achieved one of the lowest death rates, strongest economies and highest vaccination rates, in the world.

Australians have made many sacrifices during this pandemic, and they rightly expect the result of those sacrifices to be protected.

This is what the Minister is doing in taking this action today.

Our strong border protection policies have kept Australians safe, prior to COVID and now during the pandemic.

Due to the expected ongoing legal proceedings, I will be not be providing any further comment.

READ MORE: Novak Djokovic has visa cancelled just days before Australian Open

Police are currently carrying out a large-scale search for a missing nine-year-old girl in the Blue Mountains.

Charlise Mutten, 9, was reported missing from a Mt Wilson property at about 8.20am today.

Officers said Charlise has been missing since Thursday.

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Charlise is described as being of Caucasian appearance, with brown hair.

It's not known what she was wearing at the time.

Hundreds of officers, along with State Emergency Service (SES) and Rural Fire Service (RFS) crews, are looking through dense bushland at Mt Wilson.

Crews are looking in tents and bins for any sign of the child.

"A command post has been established at the Mt Wilson RFS Station with volunteers from the RFS and SES assisting police from the Blue Mountains Police Area Command, Police Rescue, the Dog Unit, and PolAir," NSW Police said in a statement.

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A woman was comforted by ambulance officers at the search centre before being taken to a Katoomba hospital.

Police are appealing for help from the public and have sent out geo-targeting messages.

Late this afternoon, a car was seized in Penrith by police.

The search will continue into this evening and begin again at first light tomorrow.

9News understands the homicide squad has been called in to assist local detectives.