The FSB revealed details of the preparation of a terrorist attack in Moscow's Tsaritsyno.
The boy is suspected of preparing an attack on the grounds of the Tsaritsino Museum Reserve.
The detainee posted photos on the banned network in tactical clothing, a balaclava and with an object similar to a machine gun. Photos from the park were accompanied by the caption "I found the place".
During the search they found the appropriate equipment, and on the phone - the account from which the threats were distributed. It was also reported that a boy subscribed to a neo-Nazi channel.
The Russian FSB thanked the American intelligence services for the information about the impending terrorist attack.