Mumbai, June 23 (Reporter) The BSE Sensex on Monday tanked by 601.04 points to 81,807.13 in early trade, influenced by Asian market trends as investors closely monitor potential retaliatory actions by Iran following a US attack on its nuclear site, traders said. The Nifty too declined by 178.90 pts to 24,933.50. Sensex registered intra-day highs and lows at 81,984.44 and 81,702.52, respectively. The Nifty registered a day's high at 24,988.10 and a low at 24,929.55 pts. Midcap fell by 285.36 points, and small cap declined by 274.27 pts. All sectoral indices were trading in red, with IT being the top loser, down by 1.23 pc. Other losers were Commodities by 0.54 pc, Energy by 0.60 pc, FMCG by 0.58 pc, Financial by 0.61 pc, Healthcare by 0.49 pc, Industrial by 0.43 pc, Telecom by 0.32 pc, Utilities by 0.67 pc, Aito by 0.56 pc, Banxex by 0.62 pc, Capital Goods by 0.22 pc, Consumer Durables by 0.85 pc, Metals by 0.74 pc, oil & gas by 0.39 pc, Power by 0.91 pc, Realty by 0.77 pc and Teck by 0.92 pc. Sensex gainers were BEL by 2.03 pc to Rs 416.35 and Bharti Airtel by 0.08 pc to Rs 1,938.05. The Sensex losers were Infosys by 1.83 pc to Rs 1,592.00, HCL Tech by 1.28 pc to Rs 1,717.40, HUL by 1.23 pc to Rs 2,276.45, Eternal by 1.09 pc to Rs 250.65, Asian Paints by 1.05 pc to Rs 2,261.00, Power Grid by 1.04 pc to Rs 290.15 and TCS by 0.97 pc to Rs 3,401.40...////...