A man arrested in connection with the death of Hannah Williamson in Great Yarmouth is still in police custody.
The man, in his 20s, was arrested in Thetford on Sunday following the death of Miss Williamson on Friday.
The 21-year-old, from Freethorpe and who was a keen dancer and went to Taverham High School, died in Marlborough Terrace.
A post mortem examination proved inconclusive and further tests are due to be carried out as police continue to treat her death as unexplained.
A second man had been arrested and released by police in connection with the incident.
That man, in his 30s, remains under investigation while the enquiry continues.
Anyone with information about the incident is asked to contact Norfolk Constabulary on 101 or Crimestoppers anonymously on 0800 555 111.
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