Mumbai, Aug. 22 -- The key equity indices traded with major losses in the mid-morning trade, pausing a six-day winning streak driven by optimism surrounding Goods and Services Tax (GST) reforms. The cautious sentiment came as investors awaited Federal Reserve Chair Jerome Powell's policy remarks at the Jackson Hole symposium later in the day.

The Nifty traded above the 25,000 level. Media shares advanced after declining for previous two consecutive trading sessions.

At 11:30 ST, the barometer index, the S&P BSE Sensex, slumped 518.28 points or 0.64% to 81,474.48. The Nifty 50 index fell 160.95 points or 0.64% to 24,922.65.

In the broader market, the S&P BSE Mid-Cap index shed 0.06% and the S&P BSE Small-Cap index fell 0.13%.

The marke...