"Urgent. Search is underway in Kamianka summer houses, in Marlen Mustafaiev's home. He was detained as he was heading to work," Arifm wrote.
Arifm added that people looking like Crimean Tatars are not allowed to pass through the area, calling it "double standard."
Lawyer Emil Kurbedinov reported that Marlen Mustafaiev is to be delivered to the FSB Center on extremism countermeasures.