A state of disaster was declared in Australia's Victoria on Sunday, with the local government implementing a night curfew as part of its harshest movement restrictions to date to contain the coronavirus.

State Premier Daniel Andrews said that the new restrictions, to be in place for six weeks until mid-September, will allow only one person per household to go shopping once a day. 

Melbournians will not be able to go further than five kilometers from home.

Australia's government expressed support for the strictest social-distancing measures yet by the state of Victoria in an effort to contain the new coronavirus.

The backing by the federal government, ruled by a Liberal Party-led coalition, for the measures by Victoria's Labor Party government shows national unity of message across the political spectrum in a country with a loose federal system.

Melbourne, Australia's second-largest city, is already under a reimposed six-week stay-home order, but it has been struggling to rein in COVID-19. Record numbers of new infections of the virus that causes the disease were reported last week, prompting warnings of further restrictions.

The state reported more than 650 infections on Sunday, up from 397 cases Saturday, ABC News television reported, citing unnamed sources.

Education Minister Dan Tehan told Sky News that the federal government would "absolutely" support Victoria in ramping up its measures.

"We will continue to offer as much support as we can," Tehan said. "There's no question these are very difficult times in Victoria."

Australia has fared far better than many other countries in keeping the coronavirus from spreading, but at a high economic cost. It has recorded around 17,300 coronavirus cases and 200 COVID-19 deaths, but the recent surge in Victoria has proven difficult to contain.

The measures would limit transport options and affect many retail outlets. Restaurants, which now allow delivery and take-away options would be limited to contact-less pick-up orders, Melbourne newspapers reported.

Movement restrictions and business operations would also be limited in the rest of the state, but not to the same level as in Melbourne.

(Cover: Women hold signs outside housing commission apartments under lockdown in Melbourne, Australia, July 6, 2020. /AP Photo)