New Delhi: A fast-track court here on Tuesday pronounced four accused guilty in the 2012 December 16 Delhi gang-rape case. Of the total six accused, the prime conspirator -- Ram Singh -- had earlier this year killed himself in jail, while a minor accused was on August 31 sentenced to three years in a special home by the Juvenile Justice Board. br br The 23-year-old trainee physiotherapist was lured by the six onto a bus on December 16 last year, where they raped and tortured her with a metal bar.