Mumbai, Sept. 12 -- The key domestic indices sustained upward momentum in morning trade, ahead of the CPI inflation data due later today. Optimism over improving India-U.S. ties kept sentiment buoyant, pushing the Nifty above 25,050 mark.

Auto shares advanced after declining in the past three consecutive trading sessions.

At 10:25 IST, the barometer index, the S&P BSE Sensex gained 207.02 points or 0.25% to 81,755.75. The Nifty 50 index advanced 64.85 points or 0.26% to 25,071.05.

In the broader market, the S&P BSE Mid-Cap index rose 0.25% and the S&P BSE Small-Cap index jumped 0.28%.

The market breadth was positive. On the BSE, 2,091 shares rose and 1,563 shares fell. A total of 231 shares were unchanged.

Buzzing Index:

The Nifty A...