A stock broker looks on during a trading session at the Pakistan Stock Exchange in Karachi on July 31, 2023. — AFPKARACHI: The Pakistan Stock Exchange witnessed its highest-ever single-day decline on Thursday. The benchmark KSE-100 index plunged by 6,482 points as investors opted for panic selling following further escalation in geopolitical tensions.Amid the sharp sell-off, trading was temporarily halted for one hour after the KSE-30 Index dropped more than 5.0 per cent for five...