The Sensex opened with a negative gap of 289 points at 12,694, and soon tumbled to a low of 12,518 - down 465 points from the previous close following heavy losses in other global markets.The index is now down 366 points at 12,617.All index stocks are in negative zone.ACC plunged 5% to Rs 712. Gujarat Ambuja, ICICI Bank and Satyam shed 3.7% each to Rs 102, Rs 845 and Rs 436, respectively.HDFC Bank, Tata Motors, Reliance Communications, Bharti Airtel, Tata Steel and Wipro have dropped around 3% each to Rs 930, Rs 750, Rs 404, Rs 742, Rs 432 and Rs 565, respectively.
