Insight: Spiral of Karachi killings widens Pakistan's sectarian divide

(Repeats Sunday item with no change to text) * Sectarian killings emerge as growing threat to Pakistan'sstability * Reuters examines new cycle of tit-for-tat murders inKarachi * Radical Islamist calls for boycott of Shi'ite minority * Small Shi'ite force hunts clerics in retaliatory attacks KARACHI, Feb 24 (Reuters) - When Aurangzeb Farooqi survivedan attempt on his life that left six of his