The Mumbai police have registered a case against the brother of a bank's chairman for allegedly threatening to frame a former director of the same bank in a drugs case and sending offensive messages about his daughter, an official said on Saturday, reported news agency PTI.

Accused Dinesh Jaya Suvarna (45) targeted complainant L V Amin after the latter recently contested against the former's brother Surya Jaya Suvarna for the post of chairman of Bharat Co-operative Bank, the official said, reported PTI.