Russia’s Federal Security Service (FSB) announced Thursday the prevention of a planned terrorist attack targeting a courthouse in Mariupol. According to the FSB, a Russian citizen was detained in connection with the plot. The FSB alleges the individual was acting under the direction of Ukrainian special services. No details regarding the specific nature of the planned attack have been released. The announcement comes amid ongoing conflict between Russia and Ukraine, and heightened tensions in the region. Ukrainian officials have not yet commented on the FSB’s claims. The detained individual is currently in custody, and investigations are ongoing, according to the FSB.