The Newcastle, Lake Macquarie, Maitland, Port Stephens, Singleton, Dungog, Muswellbrook and Cessnock local government areas will be under stay-at-home orders for at least a week from 5pm, after it was revealed that the Coronavirus had spread to the Hunter.

NSW Police Northern Region commander Assistant Commissioner Peter McKenna said he was urging the Hunter to follow the example of Orange, in the state's Central West, which was put in lockdown last month but managed to come out of it in a week.

"Obviously it's a significant change for the people of this area but we all have to abide by this lockdown if we're going to make a difference and really keep this virus at bay," he said.

"The thing I will say is up until this point in time the people of this area, the Hunter Region, have really done the right thing.

"We have shown our resilience and we always do in times of crisis in this area, so once again I appeal to all the members of the public, the whole community - let's work together, let's abide by the public health orders and let's try to get out of this lockdown as quickly as we can."

A crisis management command post has been set up at Newcastle Police Station for police to liaise with government agencies.

Officers will be out performing compliance duties through the week, checking people are using QR codes and masks where necessary.

They will also be helping Transport for NSW and NSW Health officials with logistics at the region's busy testing sites.

Assistant Commissioner McKenna said there would be no grace period in play for people who breached the public health orders.

"Whilst this lockdown is new to the Hunter Region, I think no-one can say they aren't informed about COVID-19 and this Delta variant and what's been happening in Greater Sydney and across NSW," he said.

"There's no time for warnings now, we have to get across this."

Assistant Commissioner McKenna also urged people not to "panic buy" at supermarkets.

Video was emerging on social media on Thursday afternoon of physical altercations breaking out in the aisles of some stores along with vision of massive queues outside supermarkets.

"You don't need to panic buy or do anything like that because shopping is an essential reason [to leave home]," Assistant Commissioner McKenna said.

"So let's make sure we look after one another, we work together and we really keep this virus at bay."

Police were not called to the gathering at Blacksmiths beach on Friday night, which was mentioned in the government's press conference on Thursday morning and is being investigated by NSW Health contact tracers.

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