The cause of death of a woman in her 20s who was found dead in her flat has remained a mystery following a post-mortem examination.

Police were called to an address in Middlegate, Great Yarmouth shortly after 2pm on Tuesday before pronouncing the woman - named locally as Charlotte McDonald - dead at the scene.

Now a post-mortem examination carried out today has revealed that her cause of death cannot yet be confirmed, with further tests needed.

The woman has been named locally as Charlotte McDonald (Image: Supplied)Police are continuing to treat her death as unexplained.

READ MORE: Shock over young woman found dead in flat

A police cordon remains in place across the property as officers continue to investigate the scene.

Anyone with any information that could assist the investigation should contact Norfolk Police and quote incident reference number 221 of Tuesday, November 19.