West Bengal Chief Minister Mamata Banerjee has accused the Border Security Force (BSF) of allowing infiltrators from Bangladesh into India and claimed it's a deliberate attempt to destabilize the state. Banerjee, who alleges a larger conspiracy by the central government, has also accused some district magistrates and SPs of aiding the BSF in their alleged illegal activities. She plans to send a strongly worded letter to the Centre expressing her concerns and has directed the state police to investigate the matter further.