The CBI has arrested local TMC leader and father of the main accused in the case of alleged gangrape and subsequent death of a girl in Bengal's Hanskhali area, as he played an "active role" in tampering with evidence and intimidating her family members, a senior agency official said on Saturday.

Describing the local leader as an "influential person who knew about his son's wrong-doings", the official said that the TMC member was picked on Friday along with one of his friends, who aided him.