New Delhi, Sept. 4 -- Frontline indices, the Sensex and the Nifty 50, extended losses for the fourth consecutive session on Thursday, on the weekly expiry day, amid concerns over lingering geopolitical uncertainties and elevated crude oil prices.

Technically, the Nifty continues to face a hurdle on rebound, indicating weakening near-term structure.

According to Ajit Mishra, SVP of Research at Religare Broking, the 23,800 zone remains an important near-term support, and a decisive break below this level could reopen the downside towards the 23,700-23,600 zone.

On the upside, the 24,000-24,150 region is likely to act as the resistance zone, said Mishra.

"Given the prevailing combination of elevated crude prices, geopolitical uncertainty...