That's after an outbreak of coronavirus cases in the New South Wales capital broke a two week run off zero community transmission.

30 new cases were reported on Sunday, bringing in the cluster infections to around 70.

Around a quarter of a million people in Sydney's northern beach suburbs where the outbreak occurred have been put into a strict locked down until Christmas Eve at a time when many people will be planning to travel.

The Australian Capital Territory sent a stern do not come to US message to Sydney and warned that residents will be quarantined for 14 days if they arrived and this was the message from Victoria's Premier Daniel Andrews.

I'm not gonna wait around while they add to their rules.

We're gonna protect what we have built and that is why the border will be closed from midnight tonight.

There's an extra 24 hours for returning Victorians, but they will have to go into quarantine regardless.

It will simply be at home rather than in a hotel.

Both Victoria and Queensland have banned people from Sydney arriving as off Monday, prompting some to rush to Sydney's airports.

I'm wondering should I go today?

Should I go in a couple of days and yeah, I just made the last minute decision to come today.

South Australia state imposed a 14 day quarantine for Sydney arrivals on Sunday and banned travelers from affected suburbs.

Tasmania took a similar step on Saturday while Western Australia state imposed a hard border closure.