Indian stock markets opened with selling pressure on Tuesday, tracking sharp declines in US markets amid concerns over tariffs, geopolitical tensions, and AI-led disruptions affecting global technology stocks. The Nifty 50 index opened at 25,641.80, down by 71.20 points or 0.28 per cent, while the BSE Sensex opened at 83,052.54, declining by 242.12 points or 0.29 per cent.