The South Australian government will close its border to greater Sydney after a coronavirus cluster in the New South Wales capital jumped to 70 cases. Premier Steven Marshall says the border will close to Sydney from midnight on Sunday and checkpoints will be set up to test people for COVID-19 at the NSW road border crossings and at Adelaide Airport. All people from greater Sydney will have to undergo mandatory 14-day quarantine on arrival in SA, while all northern beaches residents will be turned away. “We know this is going to significantly affect Christmas travel plans, so we don’t take these decisions lightly, but in this instance, we believe that this is the best way that we can protect South Australia from any seeding into our state,” Marshall told reporters on Sunday. Chief Health Officer Nicola Spurrier said residents of regional NSW will still be able to visit South Australia …