Australia's virus-hit state of Victoria has reported its worst death toll and case rise, prompting fears that a six-week lockdown of state capital Melbourne is not working, reports BBC.
The state confirmed 13 new deaths and 723 new cases on Thursday - a 36% jump on the case record set on Monday.
There are fears now that Melbourne's lockdown, which began on 7 July, will need to be extended.
The spike meant Australia overall had its deadliest day in the pandemic.
A 14th person died late on Thursday but his death will be included in Friday's figures as it was announced after the government's briefing.
Officials in Victoria renewed appeals for people with symptoms to get tested quickly.
Last week, the Victorian government said sick people breaking isolation rules - or not getting tested in time - was leading to continued spread despite lockdown measures.
"If you've got symptoms, the only thing you can do is get tested," said Premier Daniel Andrews.
"You just can't go to work. Because all you'll be doing is spreading the virus."
Thursday's figures dash hopes that recent lower case numbers indicated the state had turned a corner.
Under Melbourne's second stay-at-home order, people cannot leave their home except for exercise, food shopping, work and care-giving.
Melbourne has also become the first Australian city to make mask-wearing mandatory in public, and this will be extended to all of Victoria from Monday.
Premier Andrews said the latest case numbers reflected the virus's hold in the city's nursing homes - with one in six cases linked to residents and staff.
Elderly people have made up the majority of deaths reported in the past fortnight.
When the numbers first leaked out this morning, I heard a reporter on air say he hoped his source was wrong. More than 700 cases - it is a crushing blow for Melbourne's five million people. Halfway through the second lockdown, everyone was hoping their hard work would start to pay off and that the tide would turn.