Tejashwi, Kanimozhi extend support to Mamata's sit-in

"This is a conspiracy. Those who make the society toxic. We have to fight against them," Tejashwi Yadav said on his arrival.

"Was there investigation on (BJP President) Amit Shah's son?" he questioned.

Banerjee has said that the demonstration might continue till February 8.

Beginning the sit-in on Sunday night, she accused Modi and Bharatiya Janata Party chief Amit Shah of attempting a coup to destabilise her state, saying there is a "constitutional break-down".

The showdown started after the federal probe agency's officers showed up near the residence of Kolkata Police Commissioner Rajeev Kumar, who has been under the scanner in connection with the Central Bureau of Investigation (CBI) probe into the ponzi scheme scam case. Kolkata police officials then came and took away the CBI personnel.