Seven people were injured on Friday morning in the attack by a teenager with an axe on a school in Ulan-Ude, Head of the Regional Centre for Disaster Medicine of Buryatia Vyacheslav Timkin told TASS.
It is the second school attack in Russian Federation in the space of a week, RT reports.
The footage shows collapsed plaster from the ceiling, scattered furniture and books.
Five students from the seventh grade and one teacher were injured in the attack by a ninth-grade student at the school in Sosnovy Bor village, just outside the south Siberian city of Ulan-Ude.
"We were having a lesson, then someone stormed the classroom and threw a bottle [a Molotov cocktail]".
"I was hit in the head".
The victim, who is thought to be a customer, was attacked at 12.45pm in what police say was an "isolated incident".
Official representative of the Russian Investigative Committee Svetlana Petrenko told TASS earlier that the teenager acted alone, he is now in the hospital.
The Prosecutor-General's Office in Buryatia said criminal proceedings on charges of attempted murder have been initiated in the case.
Similar incidents that have taken place in Russian schools in the past six months are interlinked, a law enforcement source told Ruptly agency.
Two teenagers stabbed children and their teacher with knives in the city of Perm in the Ural mountains on Monday, injuring 15 people.
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