Karachi Stock Market (KSE) on Tuesday showed downward trend as 100-index closed below 11,900 points. The market opened with mixed trend but political uncertainty and a blast in Karachi University pushed the index downwards and 100-index shed 61 points to close at 11,848 points. Trade volume remained 110 million shares. Fuji Fertilizer Bin Qasim remained volume leader of the day and its shares decreased by 17 percent and closed at Rs 33.18.