The central agency also quizzed West Bengal Textiles Minister Shyamapada Mukherjee in connection with sale of shares of a cement plant to Saradha Group chief Sudipto Sen, and former Trinamool Congress MP Somen Mitra during the day.
CBI sources said that Bose would be produced before the Alipore court tomorrow.
Bose, owner of a Bengali daily and who was asked to appear before the CBI officials, deposed before the sleuths in the morning and was interrogated for his business dealing with Sen.
All the Trinamool three leaders made consecutive appearances during the day.
Bose is among eight prominent persons arrested by CBI in the Saradha case.
The others arrested are Sen, his aide Debjani Mukherjee, suspended Trinamool MP Kunal Ghosh, ex-West Bengal Police DG Rajat Majumdar, Assamese singer Sadananda Gogoi, East Bengal club official Debabrata Sarkar and businessman Sandhir Agarwal, all of whom have been named in a charge sheet by the investigating agency.
The hospital had also formed a medical board to diagnose Mitra's 'medical complications'.
On arriving at the CBI office, Bose told reporters that he had come as a witness and that he was not worried because he did not commit anything wrong.
