IST, the barometer index, the S&P BSE Sensex, tumbled 540.61 points or 0.70% to 76,966.06. The Nifty 50 index declined 192.20 points or 0.86% to 23,285.95.
Education Minister Bratya Basu faced protest by students who alleged outsiders led by a TMCP threatened them for organising Saraswati Puja.