Bolshoi director Sergei Filin 'knows' acid attacker
3 February 2013 Last updated at 16:22 GMT
The artistic director of Russia's Bolshoi Ballet has told the BBC he knows who was behind the acid attack which has badly damaged his eyesight.
But Sergei Filin said he won't publicly released the information until investigators are ready to make an announcement.
Steve Rosenberg reports from Moscow.