A coronavirus cluster on Sydney's northern beaches has jumped to 28 people, with authorities saying they've sourced the infection back to an international case.
NSW recorded 15 new local cases of COVID-19 in the 24 hours to 8pm on Thursday, while another case was uncovered in a person who had since travelled to Queensland.
Another 10 people were confirmed virus-positive after 8pm on Thursday.
Two cases on the northern beaches had been confirmed in the 24 hours to 8pm on Wednesday.
The peninsula has entered a quasi-lockdown, with NSW Health asking residents to stay home and not leave the area for the next three days. Aged care facilities in the area have been shut to visitors.
NSW Premier Gladys Berejiklian implored northern beaches residents to only leave home for essential reasons over the next few days.
Health authorities on Thursday night used genomic sequencing to track the outbreak of the cluster to an international case.
"The harder all of us work together, the better Christmas we'll have," Ms Berejiklian told reporters on Friday.
