A senior police officer shot three people dead during the night and injured six others in a store in southern Moscow, Russia`s top investigators said on Monday, RIA Novosti reported.

"At about 00:30 Moscow time, Denis Yevsyukov killed the driver of a Chevrolet Lanos who dropped him at the store," Investigation Committee spokesman Vladimir Markin said. "The police officer then entered the supermarket and opened fire, killing a female cashier and a man, and injuring six others. He was arrested."

Earlier reports said Yevsyukov, police chief of the capital`s Tsaritsino district, had killed two people.

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Investigators have not given information on possible motives for the shooting spree.

A police source told RIA Novosti that Yevsyukov has been taken to a psychiatric clinic for examination.

RIA Novosti