An explosive device detonated under an SUV in southern Moscow on Friday.
One man was reported to have been seriously injured. He has been identified as a man in his 70s who previously worked in Ukraine as an adviser to former Prime Minister Mykola Azarov, in the government of pro-Russian President Viktor Yanukovych.
According to the newspaper Kommersant, Russian investigators are making an early connection to Ukrainian intelligence.
On Thursday, a Russian serviceman was killed by a car bomb in St. Petersburg.
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