LAS VEGAS (AP) — Security preparations for Las Vegas' New Year's Eve celebrations include helicopter flights that officials say are routine to measure naturally occurring background radiation levels in the air over southern Nevada.
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The U.S. Department of Energy says the low-level flights in a grid pattern over the Las Vegas Strip will be conducted during daylight hours Sunday and Tuesday.
Department officials said the aerial testing is a normal part of security and emergency preparedness and that it was announcing the flights so people who see the low-flying helicopter won't be alarmed.
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Las Vegas police say they're prepared for 400,000 people to attend the celebration that officials have dubbed "The Big 20."
