Besides, lower-than-expected quarterly earnings by some more bluechip companies dampened trading sentiments.
Falling for the fourth straight session, the 30-share index dipped below the crucial 26,000-level by tumbling 608.34 points, or 2.31 per cent, to 25,656.90.
The gauge had cumulatively lost 325.35 points in previous three days.
On similar lines, the National Stock Exchange Nifty slipped below the 7,800-level by losing 180.55 points, or 2.26 per cent, to 7,773.75.
Brokers said sentiments turned distinctly weak following defeat of the BJP-led NDA in the Bihar assembly polls which would negatively impact reforms drive, triggering all-round selling.
Among other Asian markets, Hong Kong's Hang Seng was up by 0.27 per cent, while Japan's Nikkei gained 2.14 per cent in morning trade.
The US Dow Jones Industrial Average ended 0.26 per cent higher in Friday's trade.
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