The gunman who carried out the deadliest mass shooting in modern American history may have plotted a similar attack at another music festival that was attended by President Obama's daughter Malia two months ago. More than 400,000 people came out for August's annual Lollapalooza festival in Chicago's historic Grant Park, which featured performances by The Killers, Chance the Rapper, Lorde, Arcade Fire, Justice and Liam Gallagher. #InsideEdition
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