The CBI has filed a closure report on alleged irregularities in the allotment of Kilhoni coal block to Nippon Denro Ispat Limited. The agency's four-year probe did not find enough evidence to file a charge sheet. The CBI enquiry revealed that the coal ministry's notification was not in conformity with the guidelines for coal mining or the allocation letter issued to NDIL. The FIR alleged that NDIL, along with unidentified public servants, cheated the Government of India in a criminal conspiracy.