US crisis melts down Indian stocks,

US crisis melts down Indian stocks, Sensex drops 500 -Indian stocks plunged deep into the red on Monday morning as the Sensex lost more than 500 points within minutes of the market opening on concerns over the US losing its top-notch credit rating due to mounting debts.The 30-share benchmark index dropped within minutes of opening to 16,793.07 points, its lowest level since June, 2010, registering a fall of 512 points from its previous close.The NSE's Nifty was also down by 131 points at 5,079.65 points at 0930 hours, after hitting a low of 5,060.05 points earlier in the morning.