Trevor Ault reports on the alarming leak of toxic gas that sent dozens of people to the hospital in Weatherford, Oklahoma, as authorities trace the source back to a tanker truck in a hotel parking lot; Matt Gutman has the latest on the beloved college football coach and athletic director, featured Netflix's "Last Chance U," who sources say was shot on campus; Morgan Norwood has details on Ariana Grande getting rushed by a crazed fan at the "Wicked: For Good" red carpet premiere in Singapore before co-star Cynthia Erivo and security intervened; and more on tonight’s broadcast of World News Tonight with David Muir.

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