RIYADH, Saudi Arabia - Saudi Arabia's king warned Saturday that all of the Middle East is threatened by escalating conflicts around the region, from spiraling sectarian violence in Iraq to rising tensions in Lebanon to fighting among Palestinians. "Our Arab region is surrounded by dangers," King Abdullah said at the opening of a summit for leaders of the oil-rich Arab nations around the Persian Gulf. "It is like a keg of gunpowder waiting for a spark to explode." Palestinian factions are fighting each other, and Iraq is slipping into "the darkness of strife and mad struggle," a danger that also...