An emergency meeting of Australia's national security committee will consider the increasing number of coronavirus outbreaks and restrictions as the highly contagious Delta strain sweeps the country.
There are new cases in four states and territories and lockdowns or tight restrictions have been imposed in three capital cities.
Prime Minister Scott Morrison has called a meeting of the national security committee of federal cabinet to discuss the developments and says he wants to bring together state and territory leaders for a national cabinet meeting, expected to take place on Monday afternoon.
Treasurer Josh Frydenberg, who sits on the national security committee, said it would receive a briefing from Australia's chief medical officer.
Mr Frydenberg said details about the latest developments would help inform decisions about vaccines and logistics.
But asked repeatedly what the national security committee could actually do, he did not give a firm answer.
Mr Frydenberg said the committee's deliberations would feed into a national cabinet meeting to ensure consistency around state border closures and restrictions.
"Bringing the leaders together and hearing the most up to date information is important to align the responses," he told ABC radio.
"The prime minister is also talking to state and territory leaders about the importance of ensuring workers in some of these facilities where the vulnerable cohorts are are vaccinated as well."
Mr Morrison is expected to push state and territory leaders to make vaccines mandatory for aged care workers.
NSW is bracing for more coronavirus cases as Sydney faces a second full day of a two-week hard lockdown.
Queensland is reintroducing restrictions after recording two new locally acquired cased of coronavirus.
Masks will be mandatory across large swathes of the state, home visits will be capped at 30 guests and venues will need to adhere to a one person per square metre rule.
In the Northern Territory, an outbreak linked to a central Australian mine has grown to six cases.
And in Western Australia, a woman who returned from Sydney has picked up the virus, prompting increased restrictions including indoor mask use.
The outbreaks have prompted a multitude of border tightening measures, including South Australia's closure to all jurisdictions except Victoria and Tasmania.
WA also tightened its border for residents of Queensland, the NT and ACT, while Victoria added Darwin to its "red zone" list.
All states had already locked out Sydney residents.
Health authorities are continuing to track hundreds of passengers from five Virgin flights on Friday and Saturday which carried people between Brisbane, Melbourne, Sydney and the Gold Coast.
The alert was raised after a Sydney-based flight attendant tested positive to coronavirus.
