Former Kolkata police chief Rajeev Kumar could be arrested tomorrow if he appears for questioning by the Central Bureau of Investigation in the Saradha chit fund scam tomorrow, sources told NDTV. The officer - over whose questioning Bengal Chief Minister Mamata Banerjee held a 70-hour protest on the streets of Kolkata -- has been to join investigation asked by the CBI. A formal summon has been issued to him and CBI teams have visited his office and home.