Sensex tanks 323 points; Nifty slips below 11,550

Bajaj Finserv was the top laggard in the Sensex pack, shedding over 2 per cent, followed by PowerGrid, L and T, ICICI Bank, Bajaj Finance, TCS and Sun Pharma. On the other hand, HCL Tech, Infosys and Maruti finished higher.