Mumbai: The BSE benchmark Sensex fell by nearly 103 points in opening trade on Tuesday on sustained selling by funds tracking a weak trend in global markets amid renewed concerns about the euro zone debt crisis.

The 30-share Sensex, which lost 99.79 points in the previous session, fell further by 102.93 points, or 0.58 percent, to 17,602.08 in opening trade on Tuesday.

In a similar fashion, the wide-based National Stock Exchange Nifty index declined by 33.40 points, or 0.63 percent, to 5,293.30.

Stocks of capital goods, metals, banking and auto companies remained under selling pressure and were mainly responsible for the Sensex's decline.

Market experts attributed the fall in domestic equities to sustained selling by funds amid a weakening trend on other Asian bourses in tandem with overnight losses in the US market as renewed worries over resolution of the euro zone's debt crisis weakened the trading sentiment.

In the Asian region, Japan's Nikkei index fell by 1.20 percent, while Hong Kong's Hang Seng index lost 2.03 percent in early trade. In the US, the Dow Jones Industrial Average down 2.26 percent in Monday's trade.