Indian equity market indices plummeted on Friday in what seems to be a direct effect of RBI superseding the board of Yes Bank and putting a cap on its withdrawal limit. At around 9:30 am, BSE Sensex was down 1,212.94 or 3.15% at 37,257.67 while Nifty plunged by 353.90 points or over 3 per cent to fall below the sentimentally important 11,000 mark.