The Enforcement Directorate interrogated a district deputy commissioner from Sahibganj, Ramniwas Yadav, in connection with a Rs 1000 crore illegal mining and money laundering case in the district. The district commissioner who heads the district task force responsible for curbing illegal mining arrived at the Enforcement Directorate office in Ranchi at 11 am. Sources in the Enforcement Directorate said the district commissioner has been summoned again on February 6 to give his reply to some of the questions asked on Monday.