The Tajikistani authorities must immediately release a BBC journalist, apparently held solely for his writing work, who is alleged to have been tortured or ill-treated while in detention, said Amnesty International.
Urunboy Usmonov was arrested on 13 June and has been charged with participation in the banned Islamic movement Hizb-ut-Tahrir.
State security officials said on Wednesday that, despite earlier allegations made by the Interior Ministry, Urunboy Usmonov was not accused of being a member of Hizb-ut-Tahrir but that their investigation was still focusing on his involvement in the organization.
He is being held in pre-trial detention in the northern city of Khujand.
Family members reported that Urunboy Usmonov appeared to have been tortured or ill-treated while in detention. A BBC colleague who was allowed to visit him in detention said that he appeared "frail mentally and psychologically".