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Las Vegas sheriff: "The world has changed"

Roberto Lopez, from left, Briana Calderon and Cynthia Olvera, of Las Vegas, pause at a memorial site on Tuesday in Las Vegas. Photo: Chris Carlson / AP

Sheriff Joe Lombardo told reporters Tuesday the Las Vegas shooting was "obviously premeditated" given the number of weapons (43) the suspected shooter had. Lombardo said he's "absolutely concerned. The world has changed. Who would have ever imagined this situation?"

More on what else law enforcement has revealed today about the ongoing investigation: