Around a quarter of a million people in Sydney’s northern beaches have been ordered to stay at home until Wednesday midnight after a coronavirus cluster grew by 13 new cases, New South Wales Premier Gladys Berejiklian said.

Sydney, Australia’s largest city of around five million people, may see some citywide restrictions implemented in the coming days, with the northern beaches outbreak now at 39 confirmed cases, Berejiklian said. Two additional cases were under investigation.

According to a Reuters report, residents there were asked to stay home unless for one of four essential reasons: grocery shopping, work, compassionate grounds including emergency medical treatment, or visiting an isolated relative.