Mumbai: The BSE benchmark Sensex tumbled by over 191 points in opening trade on Monday as mounting worries about slowing growth and sluggish policy initiatives amid lingering uncertainty over the euro zone debt crisis prompted investors to reduce their exposure.
The 30-share index, which has lost 1,198.02 points over the past seven sessions, fell further by 191.22 points, or 1.16 percent, to 16,180.29 in the first five minutes of trade on Monday.
In a similar fashion, the wide-based National Stock Exchange Nifty index declined by 58.25 points, or 1.18 percent, to 4,847.55.
Stocks of metal, refinery, auto, banking, consumer durable and realty companies remained under selling pressure and were mainly responsible for the Sensex's decline.
The trading sentiment in the domestic market was bearish amid a weak trend in the Asia region driven by the deepening euro zone crisis, market analysts said.
They said concern that a steep rise in the inflation rate might hurt economic growth, which has pulled down infrastructure and banking stocks in recent weeks, also contributed to the lower opening in the stock market.
Meanwhile, in the Asia region, Japan's Nikkei Index fell by 0.21 percent, while Hong Kong's Hang Seng Index was down by 1.86 percent in early trade on Monday.