The Film and Television Institute of India, FTII in Pune yesterday received an envelope containing a live detonator packed with a bomb-like substance. <br/><br/>It was addressed to the institute's former director Prashant Pathrabe warning him not to invite JNU student leader Kanhaiya Kumar to the FTII campus. New FTII director Bhupendra Kainthola informed the police following which a bomb disposal unit was pressed into action.<br/><br/>Police said, they are probing the source of the package and the typewritten threat letter. Sudhir Hiremath, Deputy Commissioner of Police, said, there was no circuit in the envelope, but had it been in place, it would have gone off. He said, the package was sent through normal post from an unidentified location.