Trevor Ault has the latest on the urgent search for Nancy Guthrie, and what sources tell ABC News about the FBI’s significant increase of manpower to help local law enforcement track down Savannah Guthrie’s mother; after two deadly shootings and weeks of protests in Minneapolis, Matt Rivers reports on border czar Tom Homan announcing that 700 federal agents will be drawn down from Minnesota; as investigators pour over evidence seized from an alleged illegal bio lab inside a home in Las Vegas, Melissa Adan has details on new court documents claiming multiple employees of the home's property manager claimed they became "deathly ill" after entering the garage; and more on tonight’s broadcast of World News Tonight with David Muir.

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