The Sensex is now down 418 points at 13,381.Tata Steel, ACC and SBI have tumbled over 7% each to Rs 447, Rs 1,026 and Rs 1,257, respectively.ICICI Bank and Reliance Communications have shed 6.5% each to Rs 819 and Rs 418, respectively.HDFC Bank and NTPC have dropped nearly 6% each to Rs 1,021 and Rs 143, respectively.Reliance Energy have slipped 5.5% each to Rs 525. Bharti and Hindalco are down 4% each at Rs 602 and Rs 173, respectively.Out of 2,531 stocks traded so far, 1,928 have declined, 564 have advanced and the rest are unchanged.