Punjab National Bank, at the centre of a massive Rs 11,400-crore fraud, fell for the third straight session. The state-run lender has lost over Rs 8,700 crore in its market capitalisation in three days.
The BSE 30-share barometer, after a robust start, advanced to a high of 34,508.24 in morning trade.
However, it succumbed to across-the-board profit-booking in the later part of the session to touch a low of 33,957.33, before settling 286.71 points, or 0.84 per cent lower at 34,010.76.
Both the indices ended flat for the week. The Sensex rose marginally by 5 points, or 0.01 per cent, while the Nifty slipped by 2.65 points, or 0.02 per cent.
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Foreign portfolio investors (FPIs) sold shares worth Rs 240.29 crore, while domestic institutional investors bought shares worth Rs 49.92 crore yesterday, as per provisional data.
"Market slid despite a positive trend in global market. The alleged fraud in PNB dented investors' optimism on banks and they expect that the scam may extend to some other banks.
Sentiment turned weak after the country's trade gap soared to USD 16.3 billion in January on account of a 26.1 per cent increase in imports to USD 40.68 billion due to increased inbound shipments of crude oil, as per data released by the commerce ministry.
India's exports grew by 9 per cent to USD 24.38 billion in January, helped by a healthy growth in shipments of chemicals, engineering goods and petroleum products.
Shares of Union Bank of India declined more than 1.25 per cent after the lender said it has an exposure of Rs 1,900 crore to the PNB fraud case.
Gitanjali Gems, named in the fraud case, slumped 20 per cent.
PNB lost 2.10 per cent.
SBI was the biggest loser among Sensex components, falling by 2.55 per cent, followed Yes Bank at 2.52 per cent.
Other laggards were ICICI Bank, Maruti Suzuki, Bharti Airtel, Adani Ports, Tata Steel, L&T, IndusInd Bank, Tata Motors, Coal India, Power Grid, RIL, Axis Bank, Hero MotoCorp, Bajaj Auto, M&M, ONGC and ITC, losing up to 2.31 per cent.
Sectorally, the BSE auto index emerged as the worst performer by falling 1.65 per cent, followed by metal (1.58 per cent), PSU (1.57 per cent), realty (1.44 per cent), capital goods (1.33 per cent), oil and gas (1.19 per cent) and banking (1.17 per cent).
IT index closed marginally higher.
In the broader markets, the small-cap index fell 1.22 per cent, while mid-caps shed 1.20 per cent.
Globally, crude oil prices edged higher as the dollar stood near a three-year low in subdued Asian trade, with many markets closed for the Lunar New Year holiday.
European markets traded higher in their early deals. Frankfurt's DAX gained 0.97 per cent, while Paris CAC 40 rose 0.86 per cent. London's FTSE was up 0.76 per cent.