The American military said Sunday that the weekly number of attacks in Iraq had fallen to the lowest level since just before the February 2006 bombing of the Shiite shrine in Samarra, an event commonly used as a benchmark for the country’s worst spasm of bloodletting after the American invasion nearly five years ago. Data released at a news conference in Baghdad showed that attacks had declined to the lowest level since January 2006. It is the third week in a row that attacks have been at this reduced level. Full Story