Sensex down 73pts; Ranbaxy, NTPC down 2%

 Larsen & Toubro has surged 1.8% to Rs 2,332, and Tata Motors has gained 1.3% at Rs 707.

Maruti and Tata Steel are up 1% each at Rs 800 and Rs 623, respectively.

Out of 2,556 stocks traded so far, 1,692 have declined, 807 have advanced and 57 are unchanged.