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October 3, 2017 - Las Vegas, Nevada, United States: Scenes from inside the Mandalay Bay Resort and Casino on the Las Vegas Strip. Officers walk down the hallways of the gotel near where the shooter killed 58 people and injured 515 others. The gunman opened fire on Oct. 1 at night during a country music festival across the street from the Mandalay Bay Resort and Casino on the Las Vegas Strip. (Bild Exclusive / Polaris) ///
October 3, 2017 - Las Vegas, Nevada, United States: Scenes from inside the Mandalay Bay Resort and Casino on the Las Vegas Strip. Officers walk down the hallways of the gotel near where the shooter killed 58 people and injured 515 others. The gunman opened fire on Oct. 1 at night during a country music festival across the street from the Mandalay Bay Resort and Casino on the Las Vegas Strip. (Bild Exclusive / Polaris) ///

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Officials try to nail down Las Vegas timeline

Authorities are still trying to finalize a timeline of the events that took place leading up to the Las Vegas shooting. CNN's Brian Todd has the latest developments.

Officials try to nail down Las Vegas timeline

Authorities are still trying to finalize a timeline of the events that took place leading up to the Las Vegas shooting. CNN's Brian Todd has the latest developments.