Why did Sensex crash 1,400 points & Nifty fall below 25,400 on Thursday?

Sensex crashed 1,470 points to hit the day's low of 82,264.20, while Nifty fell below 25,400 on Thursday. Both indices ended in red, breaking a three-day streak of gains. "Firm crude prices and synchronised selling across key sectors...added pressure to sentiment," an investor said. The mixed signals from the US Federal Reserve on a rate cut also affected market.