Mumbai, May 22 (PTI): Benchmark Sensex declined by nearly 645 points while Nifty retreated to 24,600 level due to selling in IT, oil and FMCG shares amid a global equity rout triggered by surging bond yields and US debt concerns.
The 30-share BSE Sensex tanked 644.64 points or 0.79 per cent to settle at 80,951.99 with 27 of its constituents ending lower. The index opened lower and tanked further 1,106.71 points or 1.35 per cent to hit a low of 80,489.92 during the day due to across-the-board selling.
The NSE Nifty tumbled 203.75 points or 0.82 per cent to 24,609.70.

From the Sensex firms, Mahindra & Mahindra, Bajaj Finserv, Tech Mahindra, Power Grid, ITC, Hindustan Unilever, Reliance Industries and Maruti were the biggest laggards.
IndusInd Bank, Bharti Airtel and UltraTech Cement were the gainers.
"The key benchmark indices witnessed declines amid US fiscal concerns that the proposed budget bill could significantly increase the national debt, pushing US treasury yields higher due to tepid long-term bond demand. Adding to the pressure, a major credit rating agency’s downgrade of the US credit outlook sparked broad-based selloffs across Asian markets," Vinod Nair, Head of Research, Geojit Investments Limited, said.
US bond yields breached the 5 per cent mark while Japanese bond yields surged to 3.5 per cent which prompted sell-off in riskier assets and emerging markets like India.
"Indian equities followed their global counterparts and witnessed major sell-off after a sharp spike in US and Japanese bond yields made investors risk averse towards equities," Prashanth Tapse, Senior VP (Research), Mehta Equities Ltd, said.
The BSE midcap gauge declined 0.33 per cent while smallcap index went up by 0.17 per cent.
Among sectoral indices, energy dropped the most by 1.25 per cent, followed by FMCG (1.25 per cent), BSE Focused IT (1.19 per cent), oil & gas (1.13 per cent), IT (1.09 per cent) and auto (0.87 per cent).
Telecommunication and services were the gainers.
As many as 2,178 stocks declined while 1,741 advanced and 167 remained unchanged on the BSE.
In Asian markets, South Korea's Kospi, Japan's Nikkei 225 index, Shanghai's SSE Composite index and Hong Kong's Hang Seng settled lower. Markets in Europe were trading in the negative territory.
US markets ended sharply lower on Wednesday.
Global oil benchmark Brent crude declined 1.37 per cent to USD 64.02 a barrel.
Foreign Institutional Investors (FIIs) turned buyers on Wednesday after a day's breather. They bought equities worth Rs 2,201.79 crore, according to exchange data.
The BSE benchmark jumped 410.19 points or 0.51 per cent to settle at 81,596.63 on Wednesday. The Nifty climbed 129.55 points or 0.52 per cent to 24,813.45.


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Mumbai (PTI): The rupee depreciated 31 paise to settle at 91.99 against the US dollar on Wednesday, touching the lowest closing level for the second time in less than a week, amid increased month-end demand for the greenback.
Forex traders said the rupee opened higher as the US dollar index softened and a long-awaited trade breakthrough with Europe offered quiet reassurance. However, increased month-end demand for the American currency as well as the ongoing geopolitical tensions dented investors' sentiments.
At the interbank foreign exchange, the rupee opened at 91.60 and touched an early high of 91.50, but pared all the gains to touch an intra-day low of 91.99 against the greenback.
The domestic unit settled 31 paise down, revisiting its lowest-ever closing level of 91.99 against the greenback. The Indian currency previously ended at this level on January 23 when it also hit its all-time intraday low of 92 against the US dollar.
On Tuesday, the rupee rebounded from its all-time low levels and gained 22 paise to close at 91.68 against the US dollar.
Analysts said the rupee opened higher as the US dollar index softened and a long-awaited trade breakthrough with Europe bolstered investor sentiment.
India and the European Union on Tuesday announced the conclusion of negotiations for the free trade agreement (FTA), under which a number of domestic sectors such as apparel, chemicals and footwear will get duty-free entry into the 27-nation bloc, while the EU will get access to the Indian market at concessional duty for cars and wines, an official said.
The deal has been dubbed the "mother of all deals" as it will create a market of about 2 billion people.
Meanwhile, the dollar index, which gauges the greenback's strength against a basket of six currencies, was trading 0.07 per cent lower at 96.14.
Brent crude, the global oil benchmark, was trading 0.43 per cent lower at USD 67.28 per barrel in futures trade.
On the domestic equity market front, Sensex jumped 487.20 points to settle at 82,344.68, while Nifty surged 167.35 points to 25,342.75.
Foreign Institutional Investors turned net buyers and purchased equities worth Rs 480.26 crore on Wednesday, according to exchange data.
