An explosive device attached to a small drone went off in a compound belonging to Russian Navy's Black Sea fleet headquarters in Sevastopol, according to a Russian navy release on Sunday.
Medical assistance was provided to those who were injured by glass fragments in the result of the explosion, the official added.
"Five people have been injured by the scattering of glass fragments on the territory of the headquarters of the Black Sea Fleet in Sevastopol after a low-power explosive device planted in a makeshift UAV detonated in one of the premises. All the victims received medical assistance," the release noted.
Earlier, the governor of Sevastopol, Mikhail Razvozhaev, wrote on his Telegram channel that following the attack, all festive events for the Navy Day in Sevastopol have been canceled for security reasons.
Ukraine denies involvement
Sevastopol is located in Crimea, a region annexed by Russian from Ukraine. The distance from the nearest "unoccupied" Ukrainian territory to Sevastopol is at least 280 km, said reports in the Ukrainian media.
The Spokesman of the (Ukrainian) Odesa Regional Military Administration Serhii Bratchuk, denied Ukraine’s involvement in the attack on the headquarters of the Black Sea Fleet of the Russian Federation in occupied Sevastopol.
“We consider this a deliberate provocation. Units of informational and psychological special operations of the Russian Federation are at work,” Bratchuk said on local TV.