A special court in Kochi today permitted CBI to conduct further investigation in a graft case in which CPI(M) Kerala secretary Pinarayi Vijayan is an accused.<br/><br/>The case relates to award of contracts to renovate three hydel projects to Canadian firm SNC-Lavalin in 1998 when Vijayan was Power minister.<br/><br/>Judge K P Jyothindranath allowed the CBI to carry on the investigation while dismissing a petition filed by 'Crime' magazine editor T P Nandakumar.<br/><br/>The court also issued summons to S N C Lavalin and a non-bailable warrant to Claus Trendl, the vice president of the company.