Artistic director of the Bolshoi Ballet Sergei Filin was attacked with acid by an unknown assailant in Moscow.Filin suffered burns to his face and is in danger of losing his eyesight. The attack came after a period of infighting and rows within the Bolshoi Ballet Company. Pictured: Artistic director of the Bolshoi Ballet Sergei Filin at the Brand Awards 2011 ceremony in Moscow.