Sensex tumbles 504 pts, Nifty snaps 3-day gaining streak. 5 triggers behind the decline

Benchmark indices halted a three-day winning streak on Thursday as Nifty and Sensex slipped amid a broad market selloff. Metals, global tech weakness, profit booking, caution ahead of the RBI policy, and Sensex expiry dragged sentiment, with smallcaps and midcaps also ending lower.