Major developments in Bengal's signature forgery scandal: TMC expels MLAs Ritabrata Banerjee and Sandipan Saha after they complained that Abhishek Banerjee forged signatures for leader of opposition resolution. West Bengal govt forms 5-member SIT headed by DIG to probe the case. Abhishek Banerjee skips CID summons citing illness, seeks 15 days. CM Suvendu Adhikari confirms investigation started on TMC MLAs' complaint.