Photo from UNIAN

Read alsoRussia's FSB accuses Crimean Tatars of 'extremist' plot – media

"Server Mustafayev was arrested until June 9. The hearing was held behind closed doors. Now the 'court' is considering a preventive measure for another Crimean Tatar Eden Smailov, detained near Bakhchisaray on May 21," the NGO said in a statement.

As UNIAN reported earlier, Russian security forces conducted searches in the houses of Smailov and Mustafayev in Bakhchisaray.