The NSE Nifty too plunged headlong as it went below the 7,600-mark by falling 172.70 points, or 2.23 per cent, on massive selling across sectors.
Realty, infrastructure, auto, metal and capital goods were among the worst hit as investors got anxious amid a global sell-off. Power, PSU, oil and gas and banking shares also came under pressure.
The Sensex has now lost 1,309.07 points in four straight sessions.
Asian markets were in deep red, with Shanghai shares crashing 7.32 per cent, forcing authorities to suspend trading less than half an hour after opening as the new circuit-breaker tripped for the second time in a week.
China's central bank today lowered the yuan against the US dollar by 0.51 per cent to 6.5646, the lowest since March 2011.
After getting below the 7,600-mark, the NSE Nifty touched the day's low of 7,556.60 before settling at 7,568.30, a sharp fall of 172.70 points, or 2.23 per cent.
All the 30-Sensex constituents led by BHEL (6.98%), Tata Steel (6.85%) and Tata Motors (6.15%) ended in the negative territory.
The sell-off also sparked losses in Axis Bank, Maruti Suzuki, ONGC, SBI, Adani Ports, L&T, Bajaj Auto, Hindustan Unilever, NTPC, Hero MotoCorp, M&M, HDFC Ltd, Lupin, Cipla, RIL, Dr Reddy's and ITC, falling up to 4.98 per cent.
Sentiment further got dampened after global crude prices softened to multi-year lows following China's weakening currency and rising global stock reserve.
The US benchmark crude contract slid below USD 34 a barrel while Brent fell to USD 33.61 per barrel.
The BSE realty index suffered the most tumbling 4.50 per cent, followed by infrastructure 3.91 per cent, auto 3.72 per cent, metal 3.72 per cent and power 3.45 per cent.
In line with the overall trend, the BSE small-cap and mid-cap indices plunged 2.87 and 2.61 per cent, respectively.
Foreign portfolio investors net sold shares worth Rs 242.48 crore yesterday, provisional data showed.
