Information relating to the inquest into the death of singer Amy Winehouse was sent to the wrong address, police have admitted.
Police were informed on Friday that material concerning Winehouse had been delivered to the wrong property. It was later handed in at a police station in north London.
Scotland Yard said: "Police were informed on Friday October 21 that material relating to a forthcoming inquest may have been delivered to an incorrect address.
"That Friday evening the material was handed in to a police station in north London.
"Inquiries are now under way to establish the full circumstances of this matter."
The Back to Black singer was found dead at her flat in north London on July 23. Because of her very public battles with drink and drugs, news of her death was quickly followed by suggestions it could be related to one or the other but toxicology results showed there were no illegal substances in her body when she died.
A family statement said: "Toxicology results returned to the Winehouse family by authorities have confirmed that there were no illegal substances in Amy's system at the time of her death
"Results indicate that alcohol was present but it cannot be determined as yet if it played a role in her death."
An initial post-mortem examination proved inconclusive and an inquest was opened and adjourned with no cause of death given for the 27-year-old star.
The inquest into her death is due to be reopened at St Pancras Coroners Court in London on Wednesday.