After investigation, authorities named Bhullar as the bomber responsible for the 1993 Raisina Road car bomb. Bhullar's sympathizers argue that he was targeted solely for supporting the Khalistani separatist cause and for speaking out against injustices in Punjab during the 1980s, in particular students missing after police encounters, Operation Woodrose and the 1984 sikh killing. The prosecution claimed that he was part of the proscribed separatist organization, Khalistan Liberation Force. However, his family and friends deny this claim.
