Kolkata: 18 Jan 21 Stones were hurled at a BJP roadshow in Kolkata today hours after Chief Minister Mamata Banerjee’s rally at Nandigram. Bottles were heard from rooftops and reports said some people carrying Trinamool Congress flags also were heard shouting “go back” slogans.A huge police force has been deployed near south Kolkata’s Mudiali area — located near the home of the Chief Minister — to maintain calm. The state’s ruling Trinamool Congress has been toe to toe with the BJP and political tension has been rising in the city as the state elections inch closer.