Federal authorities have issued a warning to anyone thinking of actually raiding Area 51 in September.

A Facebook event post went viral over the weekend, titled “Storm Area 51, They Can't Stop All of Us.” The post was put up as a joke, calling for people to join in a raid of the U.S. Air Force base that is the center of many alien and UFO conspiracy theories.

“We will all meet up at the Area 51 Alien Center tourist attraction and coordinate our entry,” the details read. “If we naruto run, we can move faster than their bullets. Lets see them aliens.”

A pinned post on the page further cemented it as a joke, saying “Hello US government, this is a joke, and I do not actually intend to go ahead with this plan.” What has since followed is a barrage of GIFS and memes based on the proposed “raid,” with #area51 trending on Twitter’s top five over the weekend.

Even a few celebrities got in on the joke.

However, the Air Force and federal authorities are taking the matter seriously.

“[Area 51] is an open training range for the U.S. Air Force, and we would discourage anyone from trying to come into the area where we train American armed forces,” Air Force spokeswoman Laura McAndrews told the Washington Post. “The U.S. Air Force always stands ready to protect America and its assets.”

MH370 search map ATSB