Masked gunmen seized three members of Iraq’s largest Sunni Arab party and shot them to death in front of a mosque in northern Iraq, a day after gunmen elsewhere opened fire on Sunni leaders debating Iraq’s constitutional process, injuring four people. The violence came as followers of a radical Shiite cleric joined Sunni Arabs in protesting the inclusion of federalism in a new constitution, stepping up pressure on negotiators struggling to find a compromise just three days before a deadline to approve the charter.Full Story