In this handout video grab released by the Russian Federal Security Service (FSB), Russian citizens accused of preparing a terrorist attack in Belgorod, lay on a floor after detention by FSB officers in Mariupol, Donetsk People's Republic, Russia. On July 23, the FSB said in a statement that it detained two agents of the Ukrainian special services planned to set fire to a mosque in Russia's southern city of Belgorod. Editorial use only, no archive, no commercial use.