LAS VEGAS (Reuters) - The gunman responsible for the deadliest mass shooting in modern U.S. history meticulously planned the event and spent decades acquiring weapons, while he lived a secret life, Las Vegas police said on Wednesday.

Police also told a news conference that 317 of the 489 people injured in the Las Vegas shooting have been discharged from hospitals.

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(Reporting by Jon Herskovitz; Editing by Sandra Maler)