Benchmark indices fell for the third straight day on Tuesday, with the Sensex falling over 153 points amid largely weak global markets as investors remained cautious ahead of the crucial Federal Reserve meeting outcome. Unabated foreign fund outflows also continued to weigh on the domestic equity markets. Sensex fell for 3rd day to settle at 52,693.57. During the day, it tumbled 387.22 points or 0.73 per cent to 52,459.48. The Nifty declined by 42.30 points or 0.27 per cent to end at 15,732.10.