Political instability following TMC, a key UPA ally's decision to withdraw its support to the government also dampened the sentiments.
The 30-share Sensex ended at 18,349 down 147 points or 0.79% and the 50-share Nifty ended at 5,554 down by 46 points or 0.82%. The Sensex and the Nifty reached an intra-day low of 18,292 levels and 5,535 mark, respectively.
On the global front, the Nikkei average shed 1.6% on Thursday, giving up the previous session's sharp gain, as lacklustre Chinese manufacturing data reinforced concerns over flagging demand in Japan's largest trading partner.
European shares and the euro fell on Thursday after weak Chinese and French data underlined worries about global economic growth, and a promise of extra oil from Saudi Arabia also helped to push crude prices to a six-week low.
European equities opened down 0.6%, helping to keep the MSCI world index 0.7% lower. London's FTSE 100, Paris's CAC-40 and Frankfurt's DAX all opened down and futures prices also pointed to a weak Wall Street open as well.
Back home, the rupee fell to its lowest in nearly a week on Thursday as a key ally of the country's ruling coalition withdrew its support, raising worries the government may roll back key reforms such as the hike in diesel prices.
On the sectoral front, BSE Capital Goods, Metal, Oil & Gas and Power indices plummeted by almost 2% followed by counters like Oil & Gas, Realty, PSU, Banks, Consumer Durable, Healthcare and Auto, all declining between 0.5-1%. However, BSE IT index gained by nearly 1%.
From the Capital Goods space, L&T and BHEL have plunged between 2-3.5% on account of profit booking. BHEL was the top Sensex loser, down over 4%. Capital Goods shares witnessed sharp rally during last few trading sessions.
Index heavyweight Reliance Industries declined by over 3%. Kotak Securities has downgraded Reliance Industries (RIL) to sell recommendation attributing lack of reason for stock's recent run up, it gained 10.3
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