CBS/AP) Fighting eased Sunday, the second day of a U.S. and Iraqi sweep through the militant stronghold of Tal Afar near the Syrian border, as insurgents melted into the countryside, many escaping through a tunnel network dug under an ancient northern city. Iraqi and U.S. military officials vowed to expand the offensive. The 8,500-strong Iraqi-U.S. force continued house-to-house searches, and military leaders said the assault would push all along the Syrian frontier and in the Euphrates River valley. Cities and towns along the fabled river are bastions of the insurgency, a collection of foreign fighters and disaffected Sunni Muslims, many...