Activists of the Bharatiya Janata Party (BJP) and the Trinamool Congress Party (TMC) clashed here on Thursday, even as the BJP upped its protests against the Election Commission's endorsement of a returning officer's order not to allow BJP prime ministerial candidate Narendra Modi to address a rally in the congested Bemiyan area of the city, citing security concerns.br br The clashes between workers of the two parties reportedly broke out after TMC candidate for Varanasi Indira Tiwari was allegedly heckled by BJP workers.