The Central Bureau of Investigation, today filed FIR against several Trinamool Congress leaders in connection with the Narada sting case. They include TMC Lok Sabha MP Saugata Roy, Rajya Sabha MP Mukul Roy and former Minister Madan Mitra. <br/><br/>Last month, the Calcutta High Court had ordered CBI to conduct a preliminary inquiry in the case in which several leaders of the ruling party in West Bengal were seen purportedly taking money in a video aired by media portal. The Supreme Court had upheld the Calcutta high court verdict.<br/>