Reason for explosion in Belgorod is now known: piece of ammunition fell from Russian bomber
Pravda Ukraine
The recent explosion in the Russian city of Belgorod was caused by the fall of a piece of aircraft ammunition during the flight of a Su-34 fighter-bomber belonging to the Russian Aerospace Forces.
Source: Russian propaganda publication TASS referring to the Ministry of Defence of the Russian Federation
Details: According to the Russian ministry, residential buildings were damaged in the incident, but there were no casualties.