The Indian benchmark indices opened higher on Wednesday despite rising tensions between the US and Iran. The Sensex was trading at 74,434.68, up 515.92 points, while the Nifty rose 137.10 points to 23,379.20 at 9.55 am. The gains were supported by advances in Reliance Industries shares, banking stocks, and select FMCG counters, according to Moneycontrol.