Officers from Riverina Police District were tipped off that a 20-year-old woman was allegedly not self-isolating after returning to The Rock from an address in Melbourne last week.

Police claim the woman, who held a border region resident permit, never resided at her nominated address, and had travelled to locations in Victoria that were outside the designated border region.

Following inquiries, officers attended a home in The Rock and spoke to the woman on Sunday.

She was issued two infringement notices under the Public Health Act for providing false information with COVID-19 Border Control and failing to comply with noticed direction with COVID-19.

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In a separate incident, a 22-year-old man was stopped by police after attempting to enter NSW on the Sturt Highway at Buronga about 10.30pm on Wednesday.

Police state the man was unable to provide a permit and was told to return to Victoria; however, he allegedly attended a second checkpoint in Curlwaa a short time later and tried again to cross into NSW, without a valid permit.

The South Australian man was issued a $1000 PIN for failing to comply with noticed direction with COVID-19.

Police continue to appeal to the community to report suspected breaches of any ministerial direction or behaviour which may impact on the health and safety of the community.