'Storm Area 51, They Can't Stop All of Us' event has commenced in rural Nevada
Thousands of people have already started arriving in the towns of Rachel and Hiko, located close to the highly classified Air Force base
Authorities are bracing for potentially chaotic scenes after more than 2 million people said they were attending the event after a Facebook invite went viral in June
Officials are warning attendees not to approach to base and say they are prepared to make arrests
Last week, police arrested and jailed two Dutch tourists for trespassing on a government site after they were inspired by the Area 51 event
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