Pakistan Stock Exchange (PSX) came under renewed selling pressure on Tuesday, with the benchmark KSE-100 index shedding 825.22 points, or 0.48%, as concerns over prolonged Middle East tensions and elevated oil prices weighed on investor sentiment. The index started off on a strong note, climbing 324.35 points, or 0.19%, to 170,749.97 by 9:38 am, but reversed course later and remained in the red