Las Vegas gunman methodically sought to 'thwart' investigation of massacre, FBI says

By Washington Post Today at 9:14 a.m.

Law enforcement officials collected evidence outside of the Mandalay Bay Resort and Casino in Las Vegas on Tuesday, Oct. 3, 2017. Though the Mandalay Bay does bar weapons, Stephen Paddock appeared to have little trouble bringing nearly two dozen firearms and thousands of rounds of ammunition into his 32nd floor suite. (Jim Wilson/The New York Times Copyright 2018 / New York Times)

The Las Vegas gunman who opened fire on concertgoers in October carefully prepared both for the attack and the investigation that would follow, according to hundreds of pages of court documents made public late Friday.

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