Moreover, the rupee sliding to nearly a two-year low of 64.67 against the American currency weighed.
Sliding for the fourth day, the 30-share index was trading lower by 120.70 points, or 0.43 per cent, at 27,745.39, with metal, oil and gas, PSU, realty and banking stocks contributing to the fall.
The gauge had plunged 432.04 points in the previous three sessions on lacklustre earnings numbers.
Brokers said sustained selling by investors, coupled with continued capital outflows by foreign funds ahead of release of key macro data -- Index of Industrial Production (IIP) for June and consumer price inflation (CPI) for July -- hastened the fall.
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Besides, a weak trend at other Asian markets after China lowered the yuan against the dollar for the second day, fueling concern about the health of the world's number two economy, accelerated selling by participants, they said.
Bucking the trend, IT stocks such as Infosys, TCS and Wipro, which get their revenues in dollar, rose up to 1.87 per cent, backed by a strengthening greenback.
Among other Asian markets, Japan's Nikkei was down 1.10 per cent while Hong Kong's Hang Seng shed 1.49 per cent in early trade today. Shanghai fell 1.19 per cent in early trades.
The US Dow Jones Industrial Average ended 1.21 per cent lower in yesterday's trade.