Politics heats up after CBI served notice to Rujira Narula, wife of Mamta Banerjee's nephew Abhishek Banerjee in a coal scam probe. Now TMC is projecting this as BJP's politics of revenge. Earlier, CBI interrogated the kingpin of coal smuggling Anup Lala. CBI alleges that some transactions of Anoop Lala took place in the bank account of Rujira Narula Banerjee. CBI wants to interrogate Rujira in this matter. Watch video.