West Bengal Chief Minister Mamata Banerjee on September 10 filed her nomination for the bypolls to the Bhabanipur seat. This seat was vacated by the state Agriculture Minister Sobhandeb Chattopadhyay in May this year. Bharatiya Janata Party (BJP)’s Priyanka Tibrewal, and CPI(M)’s Srijib Biswas are in fray for the seat.