The CBI has filed a new case against former GAIL director E S Ranganathan for allegedly amassing assets of more than Rs 4.82 crore during 2017-22 which were disproportionate to his known source of income, officials said Monday.

Ranganathan, then director (marketing) at GAIL, was arrested in January last year in a case of alleged bribery of over Rs 50 lakh for giving discounts to private companies buying petrochemical products marketed by the Maharatna PSU, they said.