Bihar Chief Minister Nitish Kumar today recommended a CBI probe into the killing of Ranvir Sena supremo Bramheshwar Singh. An official spokesman said in Patna that the decision to this effect was taken during a meeting he had with top state police officials and home department officials at his residence this morning. State director general of police Abhayanand and principal secretary of home department Aamir Subhani also attended the meeting. The Ranvir Sena chief was shot dead by gunmen while he was taking a stroll near his house in Khopira village in Bhojpur district on Friday last.