"No clear link to bats." A WHO led COVID-19 investigation has been completed.

A World Health Organisation-led team who spent almost a month in Wuhan has been unable to find exactly how the virus was transmitted to humans.

The WHO team has dismissed suggestions the pandemic was sparked by a lab leak in Wuhan.

It determined the virus was most likely to have been transmitted through an animal, but exactly which animal remains unclear.

Scientists found no clear link to bats, pangolins or any other wild animals.

The delegation also found the virus may have been spread through frozen food, and could have been active in other regions or countries before the first cases emerged in Wuhan.

Health Minister Greg Hunt said the WHO team's findings were pretty straightforward.

Mr Hunt said it was overwhelmingly likely the virus came from the animal kingdom and originated where the first human cases were found.

"It's not surprising that there are no surprises," he told theABC.

Nationals senator Matt Canavan said the answer would probably never be known.

"Through this whole process China has acted like it had something to hide and it has frustrated the inquiry, dragged it out," he told Nine on Wednesday.

"It's not really any surprise that a year on, or over a year, that it's become too hard to find the origin. We needed this inquiry to start pretty much straight away."

Eddie McGuire quits as Collingwood president because he's become a "lightning rod for vitriol".

Eddie McGuire has quit as Collingwood president, accusing critics of making his position at the AFL club untenable.

The media personality had been set to leave the Magpies at the end of the 2021 season.

However, his response to the findings of a leaked report that found systemic racism at Collingwood and the backlash that followed, forced him to bring forward the end of his 22-year tenure.

Eddie McGuire choked back tears as he stepped down as President of Collingwood Magpies, effective immediately, following a report into systemic racism at the club. pic.twitter.com/L6sGJ3sFge

— 10 News First (@10NewsFirst)

McGuire initially declared the release of last week's Do Better report as a "proud and historic day" for Collingwood.

But in an emotional statement to the media on Tuesday, McGuire said continuing in his role was "not fair" or reasonable for the club or the community.

"People have latched on to my opening line last week, and as a result, I have become a lightning rod for vitriol - but worse, have placed the club in a position where it is hard to move forward of our plans with clear air," the 56-year-old said.

US Senate starts Trump impeachment trial.

The Senate has begun former US president Donald Trump's second impeachment trial on a charge that he incited a deadly insurrection at the US Capitol on January 6.

Senators will engage in up to four hours of debate on the constitutionality of impeaching a former president.

Each side has two hours to make its case on Tuesday, after which the Senate is expected to vote and reject the Republican efforts to dismiss the trial.

The Democrats only need a simple majority to move forward.

House Democrats to present evidence "nobody has seen before," aides say https://t.co/gjj9prFvhF

— CBS News (@CBSNews)

Opening arguments from the House Democrats start on Wednesday and Trump's lawyers are expected to mount their defence starting on Friday.

Trump's lawyers say he is not guilty of the sole charge of "incitement of insurrection" and that his fiery words were just a figure of speech as he encouraged a rally crowd to "fight like hell".

Prosecutors say he "has no good defence" and have promised to present new evidence.

Democratic congressman Jamie Raskin has cried while recounting the terrifying Capitol attack, and a video has played in the Senate chamber of gruesome scenes riot, with some of the 100 senators watching on covering or rubbing their eyes while it played.

the acoustics of a half-filled Senate chamber are excellent. the sounds of the mob just surrounded us all over again. when the video stopped, there was this suspended silence. when Raskin started speaking again, it felt like the room took a breath. (I, at least, took a breath.)

— Emily Cochrane (@ESCochrane)

Trump is the first former US president to be tried after leaving office.

Princess Eugenie gives birth to boy.

Princess Eugenie, granddaughter of Queen Elizabeth, has given birth to her first child, a baby son, with husband Jack Brooksbank, Buckingham Palace says.

Eugenie, the 10th in line to the British throne and younger daughter of the Queen's third child Prince Andrew and his ex-wife Sarah Ferguson, the Duchess of York, and her son are both doing well, the palace said.

The baby is the ninth great-grandchild for the 94-year-old Queen.

"The Queen, the Duke of Edinburgh, the Duke of York, Sarah, Duchess of York, and Mr and Mrs George Brooksbank have been informed and are delighted with the news," the palace said.

Eugenie, who married Brooksbank at Windsor Castle in 2018, announced the news on her Instagram account with a picture of the new parents holding the newborn's hand.

Family of three may be Vic hotel outbreak source.

Authorities are working on a theory that a family of three is the source of a growing outbreak at a Victorian quarantine hotel.

Two new cases linked to the Holiday Inn at Melbourne Airport were unearthed on Tuesday, including a food and beverage worker and an already released returned traveller.

A woman in Victoria has tested positive for coronavirus after completing her mandatory 14-day isolation at the Holiday Inn at Melbourne Airport https://t.co/1NWIk2RdKp

— The Sydney Morning Herald (@smh)

It brings the total number of cases associated with the cluster to three, with an authorised officer at the hotel testing positive on Sunday.

Chief Health Officer Brett Sutton said the cases are likely linked to transmission on a floor with known COVID-positive guests.

That includes a family of three, one of whom has been transferred to intensive care.

Mr Sutton indicated the infected workers and former guest appeared to have picked up the virus from the family despite having no close contact as he defended the state's quarantine system.

Health authorities overnight issued a notice of several new exposure sites including Sunny Life Massage, Bakers Delight, Aldente Deli, Sushi Sushi and Asian Star - all in Sunbury Square Shopping Centre in Sunbury - as well as Cellarbrations and PJ's Pet Warehouse also in Sunbury.

Djokovic, Williams headline Australian Open day three.

World No.1 Novak Djokovic and 23-time grand slam winner Serena Williams will be among the headline acts on day three of the Australian Open.

Djokovic cruised past Jeremy Chardy 6-3 6-1 6-2 on Monday and will start as hot favourite against the talented 23-year-old American Frances Tiafoe, the world No.64, on Rod Laver Arena in Wednesday's stand-out match.

Djokovic, who is seeking an 18th grand slam and ninth Australian Open crown, has started the tournament in the sort of ominous form that could see him close the gap on Rafael Nadal and Roger Federer, who both have 20 titles.

. @DjokerNole, the floor is yours 💙 #AO2021 | #AusOpen pic.twitter.com/SqWLhhQghQ

— #AusOpen (@AustralianOpen)

Williams defeated Laura Siegemund 6-1 6-1 in her opening-round match, and will take on world No.99 Nina Stojanovic on Wednesday.

Her older sister Venus Williams faces off against Italian Sara Errani, while Naomi Osaka takes on Caroline Garcia.

Crown faces fight to keep casino licence.

Crown Resorts will attempt to convince the NSW gaming regulator it can reform despite a former judge concluding it is not fit to run a casino, while also facing calls for more scrutiny in Victoria.

Crown facilitated money laundering through subsidiaries' bank accounts then failed to act when it was drawn to their attention in public media reporting, the report found.

Australia’s casino giant Crown Resorts is reeling tonight after a year-long inquiry in new South Wales found the company isn’t fit to hold a casino licence in Sydney, and the damning report could have repercussions for Crown’s Melbourne and Perth operations. #abc730

— abc730 (@abc730)

Commissioner Patricia Bergin, a former judge of the NSW Supreme Court, told the NSW Independent Liquor and Gaming Authority that alone rendered Crown unfit to hold the licence for its $2.2 billion casino in Sydney's Barangaroo.

It also put its staff i