Sustained selling at higher levels saw the Sensex tumble into the negative zone.The index is now down 62 points at 10,337.Tata Power has dropped 2.3% to Rs 486.While HLL has shed 2% to Rs 229, Reliance is down 1% at Rs 944.HDFC has advanced 1.5% to Rs 1,142. BHEL, Maruti and ONGC are up over 1% each.
