South Australians are flocking to shops and services ahead of the start at midnight of some of the strictest measures Australians have faced since the pandemic began. The tough new measures are being introduced in the hope they act as a circuit breaker on the spread of a cluster of coronavirus cases in Adelaide. We hear from those impacted and from a leading biosecurity expert, Professor Raina MacIntyre on the six day shutdown.

Also:

* The South Australian outbreak has quickly revealed vulnerabilities in the contingency plans of the state's neighbours. Booked hotels and a bird strike on a plane are among the reasons the NT government has got itself in difficulties after it was overwhelmed by a flood of arrivals in Alice Springs from SA.

* The New South Wales gambling regulator says it's "not comfortable" with Crown Resorts opening a multi-billion-dollar venue in Sydney's Barangaroo district after a startling admission from the casino operator.

* China correspondent Bill Birtles on the reaction in Beijing to the promised new defence pact between Australia and Japan.

* And... Donald Trump's continuing to purge his top security officials. The latest victim is Chris Krebs, the cybersecurity expert who declared this month's U-S election the "most secure in history".