For long, the BJP has accused Abhishek Banerjee of involvement in the coal scam. Kolkata/ New Delhi: Trinamool leader Abhishek Banerjee's wife Rujira Banerjee, who was asked on Sunday to join the CBI probe in a case involving allegations of coal smuggling, today said she is "unaware of the reason of questioning". She has offered to meet the investigating officers between 11 AM and 3 PM on Tuesday. Abhishek Banerjee is West Bengal Chief Minister Mamata Banerjee's nephew and the summons come just months ahead of the state elections. "Though I am unaware of the reason for me being called for questioning or the subject matter of the investigation, you may visit my residence as per your convenience between 11 AM and 3 PM tomorrow, i.e. 23 February, 2021," she said in her letter to CBI, delivered just short of 11 AM today.