AP - LAS VEGAS ? After five days of scouring the life of Las Vegas gunman Stephen Paddock and chasing 1,000 leads, investigators confessed Friday they still don't know what drove him to mass murder, and they announced plans to put up billboards appealing for the public's help.Investigators have examined Paddock's politics, his finances, any possible radicalization and his social behavior ? typical investigative avenues that have helped uncover the motive in past shootings."We still do
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