A police officer takes cover behind a police vehicle during a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas. Dozens were killed and hundreds were wounded at a country music festival on the Las Vegas Strip.
A police officer takes cover behind a police vehicle during a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas. Dozens were killed and hundreds were wounded at a country music festival on the Las Vegas Strip. John Locher AP Photo
A police officer takes cover behind a police vehicle during a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas. Dozens were killed and hundreds were wounded at a country music festival on the Las Vegas Strip. John Locher AP Photo

AP PHOTOS: A selection of pictures from the past week

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