A Syrian warplane flattened a three-story building, suspected rebels detonated a deadly car bomb, and both sides traded gunfire in several hot spots across the country Saturday, activists said, leaving a UN-backed holiday truce in tatters on its second day. The unraveling of the cease-fire marked the latest setback to ending Syria’s civil war through diplomacy. Foreign military intervention is unlikely, raising the grim prospect of a drawn-out war of attrition between President Bashar Assad and those trying to topple him.
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