Brokers said the across-the-board selling was also triggered by reports that Standard & Poor's sees chances of a credit rating downgrade for India higher than for Indonesia.
The bloodbath in stock markets saw investors becoming poorer by a whopping Rs 1.63 lakh crore as nearly 1,500 stocks on the BSE platform ended the trade as losers.
On similar lines, the NSE index Nifty tumbled by 209.30 points, to 3.77 per cent to 5,341.45, after touching a low of 5,323.75. The MCX-SX's SX-40 was down 3 per cent at 10842.41.
Reports quoting Russian news agencies said the country's missile early warning system had detected the launch of two missiles from the central part of the Mediterranean Sea fired towards the Sea's eastern coastline, amid growing fears of Western military action in Syria.
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Banks were worst hit with ICICI, Axis, Yes, HDFC Bank and IndusInd seeing losses up to nine per cent.
In Sensex, Reliance Industries lost 6.07 per cent to Rs 830.10, ITC by 5.37 per cent to Rs 302.25, Infosys by 1.41 per cent to Rs 3,033.85 and TCS by 2.31 per cent to Rs 2,000.85.
Sectorally, The banking sector index fell the most losing 5.06 per cent, followed by consumer durable index (4.61 pc), Realty index (4.39 pc) and FMCG index (3.89 pc).