The 30-share index of the Bombay Stock Exchange ended the week at 13,454.00, a net fall of 348.22 points or 2.52 per cent from its last week's close.
This makes the worst ever weekly losing streak as the BSE bellwether recorded a loss of 3,980.94 points or 22.83 per cent, the biggest fall in a single string of weekly losses.
The broader S&P CNX Nifty of the National Stock Exchange plunged by 120.65 points or 2.92 per cent to close the week at 4,016.00 from its previous weekend's close.
The Nifty too registered unprecedented fall of 1,141.70 points or 22.14 per cent in the string of seven weekly losses.
Analysts attributed soaring global crude oil prices as the key factor for the on-going turmoil in Indian bourses.
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High inflation was another factor that has been a cause of concern in the markets. There were worries among investors that this would led the central bank to take further monetary measures.
The market sentiment also remained under pressure in view of fluid political situation at the Centre after Left,the key ally of the UPA government, hardened its stand on the Indo-US nuclear deal threatening to withdraw support from the government, if it moved ahead to operationalise the deal.
The global crude oil prices crossed USD 145 a barrel level for the first time during the week, raising possibility that it will have negative impact on the economic growth.