This was reported to the city administration.
“There was a conflict between students of the eighth grade of secondary school No. 21, as a result of which one inflicted knife wounds on the other,” the message says.
The victim was hospitalized in critical condition.
Earlier, a fourteen-year-old girl was detained in the Moscow region on suspicion of killing her younger brother.
In November, it was reported that a teenager was suspected of killing three people in an apartment in Lukhovitsy near Moscow.