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Queensland authorities can't rule out slamming the border shut on greater Sydney, as NSW probes whether airline crew could be behind the growing Northern Beaches COVID-19 outbreak.
The Christmas plans of Queenslanders hoping to reunite with southern relatives hung in the balance on Friday night, as NSW authorities put Sydney on its highest alert and urged residents to wear a mask.
Queensland Chief Health Officer Jeannette Young couldn't say on Friday whether the state's border would shut to greater Sydney before Christmas, warning further hot spots could be declared should community transmission grow.
The NSW government was forced to bring in new measures after an international airline crew breached quarantine restrictions, with all crews now required to isolate at two designated hotels near the airport under police guard.