Violence, arson and the vandalising of an iconic statue of 19th century reformer Ishwar Chandra Vidyasagar marked a sharp escalation in the acrimonious election battle for Bengal after BJP president Amit Shah's roadshow in Kolkata on Tuesday. Chief Minister Mamata Banerjee's Trinamool and the BJP accuse each other of smashing the statue, which is one of the most evocative symbols of renaissance in Bengal. The BJP has taken the fight to Delhi, complaining to the Election Commission and also planning a protest. Mamata Banerjee pledged a reply to what she call a "huge shame" as her party men added Vidyasagar's image to their Twitter accounts.