Within 30 minutes of the announcement, traffic was very heavy around Woolworths and Coles stores at Caringbah and just as busy inside as people stocked up, many with full trolleys.

Supabarn at Gymea was also extremely busy, with the cash register queue extending the full length of the first aisle about 3pm.

The lockdown, which also applies to Blue Mountains, Central Coast and Wollongong, applies from from 6pm today (Saturday) until 11.59pm Friday, 9 July.

Premier Gladys Berejiklian said there was no need for panic buying as shopping for food and other essential items would still be allowed.

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Premier Gladys Berejiklian's statement:

Everyone in Greater Sydney must stay at home unless it is for an essential reason.

The reasons you may leave your home include:

Shopping for food or other essential goods and services;

Medical care or compassionate needs (people can leave home to have a COVID-19 vaccination unless you have been identified as a close contact);

Exercise outdoors in groups of 10 or fewer;

Essential work, or education, where you cannot work or study from home.

Community sport will not be permitted during this period. Weddings will not be permitted from 11.59pm, Sunday 27 June. Funerals will be limited to one person per four square metres with a cap of 100 people, and masks must be worn indoors.

In all other parts of NSW the following restrictions will apply:

People who have been in the Greater Sydney region (including the Blue Mountains, Central Coast and Wollongong) on or after June 21 should follow the stay-at-home orders for a period of 14 days after they left Greater Sydney.

Visitors to households will be limited to 5 guests - including children;

Masks will be compulsory in all indoor non-residential settings, including workplaces, and at organised outdoor events;

Drinking while standing at indoor venues will not be allowed;

Singing by audiences and choirs at indoor venues or by congregants at indoor places of worship will not be allowed;

Dancing will not be allowed at indoor hospitality venues or nightclubs however, dancing is allowed at weddings for the wedding party only (no more than 20 people);

Dance and gym classes limited to 20 per class (masks must be worn);

The one person per four square metre rule will be re-introduced for all indoor and outdoor settings, including weddings and funerals;

Outdoor seated, ticketed events will be limited to 50 per cent seated capacity;

We have always indicated we will not hesitate to go further with restrictions to protect the people of NSW.

We understand this is a difficult time for everyone, however we need to take these steps now to get on top of this outbreak.

People across NSW should only enter Greater Sydney for essential purposes.