DUSHANBE, Tajikistan: Tajikistan on Wednesday denounced an “ethnic hatred” attack in Russia, in a rare criticism of its ally a day after a 10-year-old Tajik schoolboy was killed by an older pupil near Moscow.

Russia’s main investigative body, the Investigative Committee, said the 15-year-old suspect was detained and in custody after the attack in Gorki-2, a village west of Moscow in the Odintsovo district.

Authorities in Dushanbe confirmed the victim was Tajik and summoned the Russian ambassador to protest the attack.

The foreign ministry said the attack was “motivated by ethnic hatred.”

The ambassador was handed a note “demanding that Russia conduct an immediate, objective, and impartial investigation into this tragic incident,” the ministry said in a statement.