More than a million people have signed up to storm Area 51 and reveal what is hiding in the top secret base – with another million set to follow them.

A hugely popular Facebook event that urges people to break into the military facility because “they can’t stop all of us” has now been joined by more than a million people and it is quickly growing, with another million indicating they are “interested”.

The event – which appears to have been set up as a joke, but has received swift condemnation and threats from the US military – urges people to join together and attempt to get into the military base.

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

It it scheduled for 20 September but has grown quickly since it was recently established, with hundreds of thousands of people joining each day.

Best NASA pictures of the month - June 2019 Show all 15 1 /15 Best NASA pictures of the month - June 2019 Best NASA pictures of the month - June 2019 A coronal mass ejection as seen by the Chandra Observatory. This is the first time that Chandra has detected this phenomenon from a star other than the Sun Nasa Best NASA pictures of the month - June 2019 A SpaceX Falcon Heavy rocket launches from NASA's Kennedy Space Centre in Florida NASA / Joel Kowsky Best NASA pictures of the month - June 2019 Star clusters Cepheus B (top-right section) and Cepheus C (mid-left) as captured by NASA's Spitzer Space Telescope NASA/JPL-Caltech Best NASA pictures of the month - June 2019 An unexpected eruption by the Raikoke Volcano on the Kuril Islands as captured from the International Space Station NASA Best NASA pictures of the month - June 2019 Jupiter as captured by NASA's Juno spacecraft NASA/JPL-Caltech/SwRI/MSSS Best NASA pictures of the month - June 2019 A SpaceX Falcon Heavy rocket is seen shortly after launch NASA / Joel Kowsky Best NASA pictures of the month - June 2019 The Coma Galaxy Cluster as captured by NASA's Chandra Observatory, a telescope that captures x-ray emissions in space NASA/CXC/University of Chicago Best NASA pictures of the month - June 2019 Venus (bottom middle) is seen in the distance as the sun rises over earth as seen from the International Space Station NASA Best NASA pictures of the month - June 2019 Aurora Australis as seen from the International Space Station NASA Best NASA pictures of the month - June 2019 A galactic storm rages in the Teacup galaxy NASA Best NASA pictures of the month - June 2019 The galaxy Messier 59 as seen by the Hubble Telescope NASA / ESA Best NASA pictures of the month - June 2019 A Russian Soyuz MS-11 space capsule carrying astronauts returning from the International Space Station lands in the steppes of south-east Kazakhstan NASA / Bill Ingalls Best NASA pictures of the month - June 2019 The galaxy NGC 7773 as captured by the Hubble Telescope NASA / ESA Best NASA pictures of the month - June 2019 Tumultuous clouds in Jupiter's northern hemisphere NASA Best NASA pictures of the month - June 2019 Russia's Kamchatka Peninsula as seen from space NASA

The US military has attempted to discourage any potential action. Air Force spokesperson Laura McAndrews warned that soldiers stand “ready” to deal with anyone attempting to break in, and noted that it was a “open training range” filled with “American armed forces”.

“[Area 51] is an open training range for the US Air Force, and we would discourage anyone from trying to come into the area where we train American armed forces,” she said.

Ms McAndrews added: “The US Air Force always stands ready to protect America and its assets”.