KARACHI: After a three-session recovery drive, the Pakistan Stock Exchange (PSX) came under intense selling pressure as investors took profits on Friday, pushing the KSE 100 index into the red as volatility persisted ahead of the long Eidul Azha holidays next week. Ali Najib, Deputy Head of Trading at Arif Habib Ltd, said the PSX, after a mixed trading session, closed at 167,844.25, down 670.20 points or 0.40 per cent. The market opened on a positive note as investor sentiment improved amid reports of ongoing US-Iran negotiations and easing international oil prices.