Officials say car bombs in Moscow and St. Petersburg killed a senior military officer and injured an adviser to a former Ukrainian prime minister, in the latest in a series of attacks linked to the conflict in Ukraine. Russia's Investigative Committee said a serviceman was killed Thursday in St. Petersburg by a bomb in his vehicle. The committee, which is the country's main criminal investigative agency, didn’t identify the victim or say who could be behind the bombing. A car bomb on Friday in Moscow injured Sergei Zavorotnyi, who previously worked as an adviser to Ukraine’s former Prime Minister Mykola Azarov. He served under Ukraine’s Moscow-friendly President Viktor Yanukovych, who was forced from office by protesters in 2014.