Mumbai, April 28 -- The headline equity indices tumbled on Tuesday, as fragile investor sentiment deteriorated amid fading hopes of a quick resolution to the US-Iran conflict, which has sparked a surge in oil prices. Brent crude shot past the $110 per barrel mark, amplifying concerns.

Sustained foreign fund outflows further battered sentiment, while volatility spiked ahead of the monthly Nifty 50 derivatives expiry. The Nifty 50 slipped below the 24,000 mark, dragged down by heavy selling in banking and auto stocks. Energy and metal shares, however, defied the broader weakness and ended higher.

The S&P BSE Sensex dropped 416.72 points or 0.54% to 76,886.91. The Nifty 50 index fell 97 points or 0.40% to 23,995.70.

Axis Bank (down 2.65%)...