A prominent Moscow bar owner’s business partner was arrested as part of an investigation into a car bomb attack that injured the owner and his six-year-old son this week, authorities and Russian mediareported early Wednesday. CEO and co-founder of the Shaker Group, Viktor Mishachev, his son and his neighbor were hospitalized after an explosive device attached to the hood of his SUV detonated in southwestern Moscow Tuesday morning. Investigators launched a criminal probe into attempted murder, saying they believe Mishachev, 44, may have been targeted over a business or personal dispute. Around …