Police question suspect in Russian acid attack From Alla Eschenko, CNN March 5, 2013 -- Updated 0804 GMT (1604 HKT) Sergei Filin, artistic director of the Russia's Bolshoi Ballet, was attacked with acid in January. () -- (CNN) -- Russian investigators are questioning a suspect in connection with the acid attack of the artistic director of Russia's illustrious Bolshoi Ballet, Moscow police said Tuesday. Sergei Filin was doused with acid by a masked assailant in January, an attack that caused severe burns. Russian authorities gave little more detail on the investigation. In January, doctors were fighting to save Filin's sight and said it may take him at least six months to recover from the third-degree burns to his face and eyes. Filin took up the key role at the world-renowned ballet company in 2011, after three years directing Moscow's Stanislavsky and Nemirovich-Danchenko Music Theater.