A knife-wielding man went on a stabbing rampage in a Siberian city on Saturday, wounding seven people before police shot and killed him.
A statement from Russia's Investigative Committee said the mid-day attack took place on a central street in Surgut.
The suspect, who had been identified as a local resident in his early 20s, was allegedly wearing a fake suicide belt.
The statement said information was being sought on his psychiatric condition, suggesting authorities did not suspect terrorism as the likely motive.
The statement gave the number of victims at seven, down from an earlier tally of eight.
Four of the wounded were in serious condition, state news agency Tass reported, citing regional health official Vladislav Nigmatulin.
Surgut, with a population of about 320,000, is an oil- and gas-producing center 2,100 kilometers northeast of Moscow.