Breaking: People who were in the NSW Parliament, including important government MPS and the media, have been told to isolate after positive Covid cases.

The NSW Premier, Deputy Premier and Health Minister were all in in-direct contact of a case, Sky News reported.

The Parliament in Sydney CBD has since been locked down, as it appears more cases are likely being recorded.

The NSW Department of Parliamentary Services said all MPs, staff and media had to isolate if they were in Parliament on Tuesday or Wednesday.

A rapid testing site has been set up to test everyone who had been in the Parliament yesterday and Tuesday to identify cases.

The NSW Agriculture Minister has tested positive today, after attending a Sydney restaurant linked to the current outbreak and its feared he or his staff were also in close contact with some key members of the government.

There are concerns MPs and government members could become infected and impact the running of NSW.

There were fears other members and staff could also have caught the virus from a dining room in the Parliament.

Some 18-new cases have been recorded in NSW over the past 24-hours, Sky News said.

There are 2 mystery cases and the rest appear to be linked to known cases in previous days.

The fast moving and highly contagious Delta strain of the COVID-19 virus has been spreading across greater Sydney since last week, when an airport driver tested positive to the strain.

NSW Health continues to identify venues where people who were infected attended. You can see more at the NSW website.