New Delhi, Dec 12 (ANI): The Central Bureau of Investigation (CBI) on Friday arrested West Bengal State Transport Minister and Trinamool Congress leader Madan Mitra after questioning him for his alleged role in the multi-crore rupee Saradha chit fund scam case. Reacting over this CPI (M) leader Ritabrata Banerjee said that this should have happened earlier. Meanwhile, the BJP demanded West Bengal Chief Minister Mamata Banerjee's resignation and said that the links of Saradha scam are reaching towards the top leaders of TMC.