The Sensex has dropped 538 points to 13,262.Reliance Communications has plunged over 7% (Rs 34) to Rs 413. SBI has slipped 7.5% (Rs 101) to Rs 1,254. ICICI Bank is still down over 6% (Rs 58) at Rs 819. HDFC Bank is still down over 5% (Rs 60) to Rs 1,025. ACC has slipped over 6% (Rs 70) to Rs 1,035. Tata Steel has plunged 7% (Rs 34) to Rs 448.