Cachar district returning officer has filed an FIR against senior cabinet minister Gautam Roy alleging violation of poll code in Silchar which goes to bypolls on Saturday. Acting on a complaint of open cash distribution to voters on behalf of the Congress candidates, the returning officer lodged the complaint on Thursday. The authority has further served him a showcause notice. Two BJP leaders, Muktar Abbas and P.K. Das moved the Election Commission on Tuesday in New Delhi submitting a video clipping of Roy distributing cash among the voters.