Union Rural Development Minister Jairam Ramesh has said that cancellation of all allotted coal blocks is neither feasible nor advisable .He said action will be taken on the case to case basis. The Minister said that the CBI is investigating the alleged corruption in the coal bocks allocations and no one will escape the responsibility of any wrongdoings . Speaking to media at Ranchi , Ramesh accused the BJP of politicizing the CAG report on coal block allocations. He alleged the then NDA government had a non-transparent coal allocation procedure in 1998 -2004 of the NDA regime which was improved by the UPA government.