In a surprise action ahead of the West Bengal Assembly polls, a CBI team arrived at the Kolkata residence of Chief Minister Mamata Banerjee's nephew Abhishek Banerjee to question his wife in the coal scam case.

A CBI source related to probe told IANS, "A team of CBI has gone to Abhishek's residence to issue notice to his wife in a coal scam case the agency registered last year in November."