Russia's Investigative Committee said the attacker, a ninth-grader, attacked a group of seventh-grade students with an axe at a school just outside the Siberian city of Ulan-Ude, then set the room ablaze.
Five students and one teacher were injured in the attack, the committee said. The attacker was detained and was now hospitalised after a suicide attempt, the committee said.
Earlier this week, investigators opened a criminal case into a knife attack that injured 15 people at a school in the city of Perm. The case was initially reported as an assault by two masked men, but authorities later said it grew out of a knife fight between two students.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)