The main suspects in the bombing were members of a Sikh separatist group called the Babbar Khalsa, and other related groups who were at the time agitating for a separate Sikh state of Khalistan in Punjab, India. In September 2007, the Canadian Commission of Inquiry investigated reports, initially disclosed in the Indian investigative news magazine "Tehelka", that a hitherto unnamed person, Lakhbir Singh Rode, had masterminded the explosions. However, in conclusion two separate Canadian inquiries officially determined that the mastermind behind the terrorist operation was in fact the Canadian, Talwinder Singh Parmar.