Mixed trend was witnessed in Karachi stock exchange on Tuesday as the benchmark 100 index lowered by 21 points.The business activities started in positive zone in the share market and the 100 index crossed psychological barrier of 9300 points. The trading remained halted for a while due to technical fault. The market witnessed selling pressure after news about DG Khan blast. The KSE-100 index closed at 9258, down 21 points with trade volume of 190 million shares. Bank of Punjab remained volume leader with share price of Rs 20.04, up Re 1.