Benchmark equity indices tanked over 1 per cent on Monday as the escalating conflict in the Middle East and weak trends from global markets impacted investor sentiment. The BSE Sensex tanked 845.12 points or 1.14 per cent to settle at a more than two-week low of 73,399.78. The NSE Nifty declined 246.90 points or 1.10 per cent to close at 22,272.50. Barring Oil & Gas, selling was seen across the sectors. Foreign fund outflows and higher-than-expected US inflation data also impacted the market sentiment.