A powerful explosion has rung out in the Russian city of Kireyevsk, Tula Oblast. 4 em auto;padding: 5px 15px;border: #eeeff0 15px solid;background: #eeeff0;font - weight: 400; } We have launched English Twitter! Follow us! Residents assume that a drone could have been the cause of the explosion. Background: On 19 March, Russian media reported that an unidentified drone had fallen in Tula Oblast, Russia, about 250 km from Moscow