Indian stock market opened with a marginal decline as India took diplomatic measures against Pakistan in response to the recent terror attack in Pahalgam in which 26 people were killed. The Nifty 50 index began the day at 24,277.90, registering a fall of 51.05 points or 0.21 per cent. Similarly, the BSE Sensex opened lower at 79,982.18, down by 134.31 points or 0.17 per cent.