An American solar observatory has denied that aliens were involved in its security-related closure in a state known for secretive military testing and a suspected UFO crash.

The New Mexico solar observatory remains closed after being evacuated for unknown reasons last week.

“I can tell you it definitely wasn’t aliens,” a spokeswoman for the National Solar Observatory, part of the Sunspot Solar Observatory consortium, told The Washington Post.

Meanwhile, an investigation was underway by the Federal Bureau of Investigation (FBI).

“We don’t know anything. We’re just as curious as anyone else,” one guard said.

No local law enforcement was involved in the case as the FBI remained on the scene.

“They wouldn’t give us any ­details,” Otero County Sheriff Benny House said. “I’ve got ideas, but I don’t want to put them out there. That’s how bad press or rumors get started, and it’ll cause paranoia, or I might satisfy everybody’s mind and I might be totally off base.”

The observatory is also taking the chance to attract the people’s attention to its work.

“With the excitement this closure has generated, we hope you will come and visit us when we do reopen, and see for yourself the services we provide for science and public outreach in heliophysics,” it said.