In one of the breaches, a man was supposed to be completing his quarantine at a nominated address in Katherine.

Instead, the 54-year-old was attending a local sporting event.

Earlier in the week another man who was supposed to be in quarantine has been discovered by chance having a coffee in a Katherine cafe.

The 40-year-old arriving into the Territory on July 1 and was supposed to be still in self-quarantine.

He was spotted by a quarantine compliance team members at the cafe.

The man said he was out "doing errands" and wanted a coffee.

Police have issued a further six quarantine infringement notices over the last two days.

More reading: People from Sydney and Victoria told to keep away from NT.

Incident Controller Commander Matthew Hollamby said, "This continued reckless disregard by a small number of people risks undoing all of the hard work to keep this virus at bay in the NT".

Infringements have been issued to:

A 26-year-old female who arrived from NSW was located on the Tiwi Islands. When spoken to she stated she believed it was better for her to return to where she had her own room and facilities than share facilities at a home in Darwin. She has been returned to Darwin to recommence her 14-day quarantine.

A 22-year-old male who arrived by road from South Australia was located at a service station in Alice Springs when he was supposed to be in quarantine. When spoken to, he stated that he had also travelled to Tennant Creek.

A 41-year-old male arrived by road from South Australia. He travelled initially to a remote Central Australian community and was later transferred to Alice Springs where he was due to complete his quarantine in a hotel. He was located away from his place of quarantine and stated he had left because he was getting his tax done.

A 34-year-old female was reported to have breached quarantine by attending an entertainment venue in Darwin.

A 28-year-old male was completing quarantine at a nominated address in the Darwin area. A compliance check confirmed he was not at home. He returned when contacted by the compliance team and stated he had gone for a walk because he had a headache. He was apologetic and admitted he had done the wrong thing.

"The vast majority of people in quarantine are doing the right thing, and we thank them for that," Commander Hollamby said. "But it only takes one person to put everything at risk.

"We're seeing what's happening interstate and overseas - now is not the time to get complacent or disregard instructions. We need to follow the rules and guidance set by our health experts."

The infringement penalty for failing to abide by the Chief Health Officer Directions issued under section 56 of the Public and Environmental Health Act 2011 is $1,106 for an individual and $5,530 for a business.

NT Police and Environment Health Officers continue to undertake compliance activities.

A total of 26,563 compliance checks have now been completed and 138 fines issued.

For information on the changes of quarantine requirements, visit www.coronavirus.nt.gov.au.

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