Indian stock markets experienced a second consecutive day of losses, with the Sensex and Nifty 50 falling over 0.6% each due to escalating Iran-US tensions. The Sensex closed down 516 points at 77,328, and the Nifty 50 dropped 150 points to 24,176. Meanwhile, the smallcap index bucked the trend, closing in the green and outperforming the benchmarks.