A 14-year-old girl shot dead a classmate and injured five people before killing herself at a secondary school in the Russian city of Bryansk near the Ukraine border on Thursday.
School shootings are relatively rare in Russia, which has strict gun laws, but fatal attacks at educational facilities have become increasingly common in recent years.
The Kremlin and officials in Moscow have voiced growing concern after previous attacks, but the President Vladimir Putin blames the incidents as a US import.
Footage filmed by schoolchildren and shared by Russian state media showed pupils barricading themselves inside a classroom, stacking desks against a door.