New Delhi, Apr 25 (UNI) The Central Bureau of Investigation today filed a case against its former director Ranjit Sinha in a case relating to "influencing" probe into the coal block allocation cases, sources said. The case was filed against Sinha under the Prevention of Corruption Act. The former CBI chief is charged of trying to "influence" probe into the coal block allocation cases by meeting the accused persons. The filing of the FIR by the CBI against Sinha comes three months after the Supreme Court asked the agency to probe Ranjit Sinha's role. A Special Investigation Team was formed to conduct investigation into the abuse of authority prima facie committed by Sinha with a view "to scuttle enquiries, investigations and prosecutions being carried out by the CBI in the coal block allocation cases". A bench of Justices Madan B Lokur, Kurian Joseph and AK Sikri directed present CBI chief Alok Verma to set up a three members special investigation team to investigation Sinha. UNI AR SHK 2007