Sydney

Authorities believe the man, who has not been vaccinated, has been infectious since Friday.

He had not been overseas or worked in Sydney's hotel quarantine system so authorities were keeping an open mind while working to find the source of the infection, NSW chief health officer Dr Kerry Chant said.

She said authorities hoped genome sequencing would identify the source of the infection, which could be from interstate.

Chant said the man's cycle threshold (VT) values were low, which meant he had a higher viral load and was potentially more infectious.

South Australia and Queensland will remove their travel restrictions on Sunday and Monday respectively.

It comes after NSW reported 11 days without a locally acquired infection.

About 180 cases were tied to the Sydney cluster, which emerged just before Christmas and prompted nationwide travel bans on the city's residents.

"Credit to New South Wales. They got on top of their cases," said Queensland Premier Annastacia Palaszczuk on Thursday.

South Australia and Queensland will remove their travel restrictions on Sunday and Monday respectively.

It comes after NSW reported 11 days without a locally acquired infection.

About 180 cases were tied to the Sydney cluster, which emerged just before Christmas and prompted nationwide travel bans on the city's residents.

"Credit to New South Wales. They got on top of their cases," said Queensland Premier Annastacia Palaszczuk on Thursday.

From Monday, flights will resume to Sydney, while services will return to Melbourne from Tuesday and to Brisbane from Thursday.

Passenger flights between Dubai and Perth, as well as cargo operations to all Australian points, continue as scheduled.

Hundreds of Australians were last week left stranded after the major airline announced the cancellation on Friday night.

"We regret the inconvenience caused to our customers in the period where we had to temporarily suspend our services," a statement distributed by the airline read.

Most Sydneysiders will continue to be able to have 10 adult visitors to their home over the holiday period.

But in a slight relaxation of rules, young children can be included on top of that number between 24-26 December.

Sydney saw just eight new cases on Wednesday, fuelling optimism about efforts to contain the outbreak.

The New South Wales (NSW) state government said a total of 98 cases had been found in the state capital since last week.

More than 124,000 residents had been tested in the past three days alone - a local record.

The New South Wales Premier, Gladys Berejiklian, says while the number are higher than yesterday, a positive is that officials haven't seen evidence of the virus spreading significantly outside the Northern Beaches.

Everyone in the Greater Sydney area, including the Blue Mountains and Central Coast, is now asked to have no more than 10 people in their homes until Wednesday.

The Northern Beaches region remains in lockdown.

The city recorded a minimum overnight temperature of 25.4C and then hit 40C during the daytime on Sunday.

Dozens of bush fires are already burning in New South Wales with hotter weather predicted on Tuesday.

The states of Victoria and South Australia also reported soaring heat over the weekend.

"November has been quite unusual in many ways. We have only seen about half our normal rainfall and it is quite possible it will be one of our hottest Novembers on record," Andrew Watkins, of the Bureau of Meteorology (BOM) noted on Friday.

Melbourne Storm were to host the Warriors at their home ground but will instead clash in Sydney, the NRL said following consultations with biosecurity experts.

"I want to thank the Melbourne Storm players for putting the game ahead of their personal circumstances," NRL acting CEO Andrew Abdo said in a statement.

Victoria state, of which Melbourne is the capital, has recorded double-digit rises in new Covid-19 infections, accounting for nearly 90% of the 126 cases detected nationally over the past week.

On Tuesday, level two restrictions were enacted in the capital of New South Wales (NSW), a state 99.9% in drought.

These could be increased to level three within months, local media report.

Temperatures are predicted to soar above 40C (104F) from Tuesday, worsening fires which have already killed six people since October.

There are now more than 100 fires in NSW and Queensland states, many of which have been burning for several weeks.

What are the water restrictions?

A second woman was found dead inside an apartment building on the same street.

"All the information we have at hand would link these two crimes," police commissioner Mick Fuller said at a press conference.

He said the suspect was a "lone actor" with a history of mental health issues.

He was known to police but "his history was unremarkable compared to the gravity of the crimes he committed", Mr Fuller said.

The police commissioner said the suspect had some ideologies related to terrorism, but had no apparent links to other terrorist organisations.