Iraq's government will pour tens of thousands of Iraqi troops into Baghdad in an unprecedented operation to seal off the city and hunt insurgents who have launched a fresh wave of violence, ministers said on Thursday. Defense Minister Sadoun al-Dulaimi said 40,000 Iraqi troops would be deployed in Baghdad for Operation Thunder, the biggest Iraqi military operation since the fall of Saddam Hussein. Backed by the 10,000 U.S. troops in Baghdad, they will set up hundreds of checkpoints and block roads into the capital. The dramatic rise in suicide bombings and ambushes by mostly Sunni Arab guerrillas has killed more...