Equity benchmark indices tanked over 1 per cent on Wednesday after selling in index heavyweight Reliance Industries and bank stocks amid weak global market trends. The BSE Sensex fell by 790.34 points or 1.08 per cent to settle at 72,304.88. The NSE Nifty 50 slumped 247.20 points or 1.11 per cent to close at 21,951.15. All sectors ended in red with selling seen in Oil & Gas, PSU Bank, Realty, and Auto down 2 per cent each.