The alleged assailant gunned down five men and three women after a drinking session on Saturday night turned violent in the village of Redkino, some 110 kilometres northwest of Moscow, the Investigative Committee said.
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"During the get-together there was a domestic dispute between the guests, after which the suspect left and then returned with a hunting rifle," investigators said in a statement, adding that the man had been "drinking spirits". "He fired several shots, as a result of which at least eight people died."
Investigators said the shooter - a resident of Moscow born in 1974 - was detained on suspicion of mass murder after survivors managed to call the police.
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