On 6 February 1957, the Soviet government released a document dated 17 July 1947, which stated "I report that the prisoner Wallenberg who is well-known to you, died suddenly in his cell this night, probably as a result of a heart attack or heart failure. Pursuant to the instructions given by you that I personally have Wallenberg under my care, I request approval to make an autopsy with a view to establishing cause of death... I have personally notified the minister and it has been ordered that the body be cremated without autopsy." The document was signed by Smoltsov, then the head of the Lubyanka prison infirmary, and addressed to Viktor Abakumov, the Soviet minister of state security. In 1989, Wallenberg's personal belongings were returned to his family, including his passport and cigarette case. Soviet officials said they found the materials when they were upgrading the shelves in a store room.