FILE - In this Oct. 3, 2017, file photo, windows are broken at the Mandalay Bay resort and casino in Las Vegas, the room from where Stephen Craig Paddock fired on a nearby music festival, killing 58 and injuring hundreds on Oct. 1. In the two years since the deadliest mass shooting in modern U.S. history, the federal government and states have taken some action to tighten gun regulations. But advocates say they're frustrated more hasn't been done since the attack in Las Vegas killed 58 people on Oct. 1, 2017, and that mass shootings keep happening across the country. (AP Photo/John Locher, File)
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