Mamata Banerjee today launched a fierce attack on the BJP over a CBI probe involving her nephew Abhishek Banerjee's wife and targeted Prime Minister Narendra Modi using terms like "Dangabaaz (rioter)" and demon. Speaking from the same spot where PM Modi had campaigned two days ago for the approaching Bengal election, the Chief Minister also challenged the BJP to "arrest" 20 lakh Trinamool Congress workers in the state, including herself.