The leader of al-Qaida in Iraq urged Sunnis to confront Shiites and ignore calls for reconciliation in a new audiotape posted Friday on the Web, saying Shiite militias are killing and raping the Sunni Arab minority. The tape was a four-hour sermon by Abu Musab al-Zarqawi against Shiites, denouncing their top cleric, Grand Ayatollah Ali al-Sistani as an “atheist,” and saying the community had collaborated with invaders throughout Iraq’s history. Full Story