A criminal investigation will be launched to into how the cruise line operator Carnival Australia was allowed to disembark a cruise ship in Sydney.
"The only way I can get to the bottom of whether our national biosecurity laws and our state laws were broken is through a criminal investigation," NSW Police Commissioner Mick Fuller said on Sunday.
He said there was clear evidence COVID-19 has come off the Ruby Princess and at least 10 passengers have died in Australia because of it.
The investigation will look into the actions of the port authority, ambulance, police, the NSW Health deportment and Carnival Australia.
At Sunday's press conference Mr Fuller said there were "many unanswered questions" despite his early investigations over the past 48 hours.
Early indications, he said, were that police, ambulance and NSW Ports had done an excellent job.
Detective Chief Inspector Jason Dickinson of homicide will lead the investigation and the coroner will be notified.
- with Australian Associated Press