Aaron Katersky has the latest on the deadly gas explosion that’s leveled part of a nursing home in Bucks County, PA, in what police have described as a "mass casualty incident;” Matt Rivers reports on holiday travel as two powerful storms slam both coasts amid the Christmas rush, and Lee Goldberg tracks the dangerous flooding in Southern California that’s expected to continue through Christmas Eve and Christmas Day; Stephanie Ramos has details on mother Ashlee Buzzard being taken into custody after her missing daughter Melodee Buzzard’s remains were found in Utah, sources say; and more on tonight’s broadcast of World News Tonight with David Muir.

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