The funeral will take place Sept. 3 in Samarkand.
Islam Karimov's daughter has also written a message on her father's death on Intsagram: "He is gone ... I'm lost for words and do not believe it has happened."
Earlier, the Russian Interfax news agency reported on Karimov's death. However, the statement was later cast back.
The death of President Karimov was first reported by Fergana news agency Aug. 30.
Sept. 1, the same agency reported that the funeral of Islam Karimov was allegedly planned to be held in Samarkand.