Benchmark equity indices Sensex and Nifty crashed in early trade on Monday tracking a sharp spike in crude oil prices amid escalating tensions in the Middle East. The 30-share BSE Sensex tanked 2,743.46 points or 3.37 per cent to 78,543.73 in early trade. The 50-share NSE Nifty tumbled 533.55 points or 2.11 per cent to 24,645.10. On Friday, the Sensex tanked 961.42 points or 1.17 per cent to settle at 81,287.19. The Nifty tumbled 317.90 points or 1.25 per cent to end at 25,178.65.