Mumbai, April 6 -- Domestic equity benchmarks opened on a weak note, mirroring global uncertainty amid rising geopolitical tensions between the US and Iran. Investor sentiment remained cautious, further weighed down by volatility linked to the weekly Nifty F&O expiry.

The Nifty slipped below the 22,650 mark in early trade, reflecting sustained selling pressure. Sector-wise, oil & gas, healthcare, and pharma stocks witnessed declines, while PSU banks, IT, and metal stocks showed relative resilience and traded in the green.

At 09:30 IST, the barometer index, the S&P BSE Sensex, fell 382.64 points or 0.52% to 72,927.63. The Nifty 50 index slipped 105.95 points or 0.47% to 22,607.15.

In the broader market, the BSE 150 MidCap Index declined...