Gladys Berejiklian says cases of community transmission are likely to rise after three mystery cases were detected

Premier Gladys Berejiklian is warning there are likely more cases of COVID-19 circulating in the NSW community.

'I am ...expecting the number of community transmissions to increase, given those three cases yesterday,' she told ABC TV on Thursday.

'But that's what we expect in a pandemic. If you're keeping your borders open, if you have an open economy, you're keeping jobs going, you're making sure the community is supported as much as possible, whilst you're controlling the virus, you're going to have cases pop up now and then,' she said.

'And that's why I've always argued that it's better to have a resilient system, one with open borders, rather than have these artificial rules about when it's safe to open a border or not. I don't think that works, I don't think it's fair.'

Gladys Berejiklian  is expecting community transmission of COVID-19 in NSW to increase

Earlier she chided her counterparts in Queensland and Western Australia for their 'blinkered views' and unyielding border restrictions.

The NSW streak of 12 consecutive days without a single case of community transmission of COVID-19 ended on Wednesday, threatening the prospect of the Queensland border re-opening on November 1.

The Queensland government has given NSW 48 hours to find the source of the three new cases detected in NSW otherwise the countdown clock will re-start, as Queensland insists NSW must go 28 days without a single community case.

WA has applied the same 28-day benchmark and there's speculation it could keep its border closed until April.

Ms Berejiklian is furious, saying 'unrealistic expectations like that are not fair ... and it's just not the right thing to do'.

'I think it's a benchmark no state our size would ever be able to meet,' she said.

NSW 12 day streak of no community transmission ended on Wednesday. Pictured: pedestrians walk by Pitt Street Mall in Sydney CBD in May

Ms Berejiklian said she was blindsided by the 48-hour deadline imposed by Queensland to trace the source of the latest COVID cases after hearing it on the news.

'I don't know where they got that from. Does it matter how long it takes our experts to find the links?'

WA and Queensland's closed borders perpetuated a false sense of security, she said.

She reminded WA Premier Mark McGowan and Queensland Premier Annastacia Palaszczuk that GST raised in NSW subsidised their states.

'I won't complain about that. What I will complain about ... is the attitude of the premiers,' she said.

'I don't think it's acceptable. I respect them as individuals, I respect them as people ... but I think just to have this blinkered view that you're not part of a nation, you're not part of Australia is a dangerous one,' she said.

Meanwhile anyone who dined at the five-star Ripples restaurant at Milsons Point, adjacent to Luna Park, on Saturday between 8.00pm and 10.30pm has been told to get tested for COVID-19 and isolate for 14 days.

Both Queensland and Western Australia want 28 days of no community transmission in NSW before they will open their borders. Pictured: police stop a driver at the NSW-Queensland border on October 1

Contact tracing is underway but NSW Health says the details of a small number of walk-in diners on the night weren't recorded.

NSW Health has also issued a warning for anyone who was at the Mazda Artarmon repair centre on Sydney's north shore between 7.30am and 9.30am on Friday to monitor for symptoms.

None of the three new cases - a Camden woman, a Parramatta woman and a Wollondilly man - are linked to each other so far, and authorities are racing to trace their contacts.

NSW Health on Wednesday also issued an alert for who attended an 8.15am pilates class at Fitness First in Carlingford on Saturday to get tested and isolate for 14 days.

Public health alerts have also been issued for Narellan Kmart, Penrith Homemaker Centre, Penrith Guzman y Gomez, Penrith Home Co, Westfield Parramatta and Castle Towers Shopping Centre between October 2 and 5.

NSW Health have issued a public health alert for people who attended Westfield Parramatta  between October 2 and 5