Trinamool Congress MP, Sukhendu Sekhar Roy today demanded a probe into alleged destruction of three secret files on Netaji Subhash Chandra Bose. Talking to a TV news agency, Mr. Roy said that three very important files on Netaji were destroyed in 1972 by the then Congress government at the Centre and this must be probed. He said, All India Trinamool Congress also urges upon the Central Government to publish the book without further delay.