Parts of the Northern Territory will go into a three-day lockdown after an infected man travelled to the region and spent four days in the community.
The lockdown will cover Greater Darwin and Katherine and will come into effect at midday.
A man in his 30s had travelled to Darwin on Thursday after completing 14 days in hotel quarantine in Sydney.
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He returned a negative test at the completion of his hotel quarantine before being released.
The man travelled to the Northern Territory via Canberra on Thursday night.
Officials say the man spent three days in Darwin before travelling to Katherine for work where he is now in isolation.
“Like last time, we have made the decision to lock down fast because of what we do not know. We do not know yet the variant of this virus…critically, we do not know the source of his infection,” NT Chief Minister Michael Gunner said.
“We do not know if he caught it in hotel quarantine, during his time at the Canberra Airport or at any other time during his transit.
“When we don’t know everything, we have to start by assuming the worst.”