The student, whose name was not released, was detained Sept. 18 after attacking a 12-year-old boy.
He later confessed to killing two minors, aged 11 and 14, over the past two years, the Moscow police criminal investigations department reported.
Twelve other boys were severely wounded by the psychopath, it said.
The student, armed with knives or sharpened iron bars, used to attack his victims in the stairwells and elevators of the apartment blocks where they lived.
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