What is Mamata Banerjee scared of, the ruling BJP questioned today as it clashed with the Bengal Chief Minister, who has launched a sit-in protest over an investigation into two chit fund scams allegedly involving members of her Trinamool Congress party. The confrontation between the BJP and Bengal's ruling party flared up on Sunday after a CBI team that wanted to question Kolkata police chief Rajeev Kumar was taken to a police station and detained for hours before they were released. "Is Mamata Banerjee trying to protect herself? Why is she running way from the inquiry," asked Union Minister Prakash Javadekar.