With more than 180 million in 28 states broiling under extreme heat alerts, forcing changes to some July 4th events, Matt Rivers reports on the beachgoers outside New York City being warned of sharks after a person was bitten on the foot, and Lee Goldberg tracks the heat wave; Alex Stone has details on the skydiver that crashed into a crowd during opening night at a rodeo in Southern California; As Americans gear up for the Fourth of July, David Muir shares a preview of ABC's 24-hour celebration, starting tonight with David's trek to the Statue of Liberty's torch.; and more on tonight’s broadcast of World News Tonight with David Muir.

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