Bengal Chief Minister Mamata Banerjee has called off the sit-in protest against the centre amid a full blown political stand-off that saw a host of opposition leaders extending support to the Trinamool Congress chief. The Central Bureau of Investigation, whose move to barge into the house of the Kolkata police chief and question him triggered the mega row, went to the Supreme Court, which heard the evidence against Rajeev Kumar today. The CBI has accused Rajeev Kumar of being a "potential accused" in the Saradha and Rose Valley Ponzi schemes -- cases he investigated -- and said it was possible that he might have tried to destroy evidence. Rajeev Kumar cannot be arrested, the top court has given the verdict and his questioning will be done in Shillong.