“It was completely intended to be a joke,” says Matty Roberts, the creator of the Storm Area 51 Facebook event. But now 2 million people claim they are going to the Nevada desert on September 20 to raid Area 51. The goal is to reveal any UFOs or aliens held within the US Air Force base, which has spurred conspiracy theories for decades. https://cnn.it/2zxqTn7 | CNN Replay