U.S. Ambassador Zalmay Khalilzad warned in an interview broadcast Friday that Iraq faces the possibility of sectarian civil war if efforts to build a national unity government do not succeed. He said such a conflict could affect the entire Middle East. Khalilzad told the British Broadcasting Corp. that political contacts among Sunni, Shiite and Kurdish leaders were improving, but that within the general population, “polarization along sectarian lines” was intensifying — in part due to the role of armed militias. Full Story