Equity benchmark Sensex dropped over 600 points in opening trade on Monday tracking losses in index-heavyweights Reliance Industries, HDFC twins and ICICI Bank amid weak cues from global markets.

Investors were also cautious as crude prices surged after top oil-producing nations agreed on output cuts to shore up oil prices.

After hitting a low of 30,541.97, the 30-share index was trading 581.75 points or 1.87 per cent lower at 30,577.87.

Similarly, the NSE Nifty was quoting 169.85 points, or 1,89 per cent, up at 8,942.05.

Bajaj Finance was the top laggard in the Sensex pack, shedding up to 8 per cent, followed by Mahindra and Mahindra, Maruti, ONGC, Titan and Bajaj Auto.

On the other hand, Bharti Airtel, L&T, Infosys and NTPC were the gainers.

In the previous session on Thursday, the BSE barometer ended 1,265.66 points or 4.23 per cent higher at 31,159.62 and the NSE Nifty soared 363.15 points, or 4.15 per cent, to 9,111.90.

Foreign institutional investors (FIIs) were net buyers in the capital market, as they bought equity shares worth Rs 1,737.62 crore on Thursday, according to provisional exchange data.

Market remained closed on April 10 for Good Friday.