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 Correction: This story has been updated to reflect that the NSF, NSO and AURA decided to evacuate the observatory without advisement or assistance from the FBI. 
 
 Mystery solved. 
 
 Authorities say it wasn’t aliens, but a janitor’s unsavory tastes that ultimately led to the closure of an observatory in southern New Mexico. 
 
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 The Sunspot Observatory was evacuated when that same janitor made veiled threats against the facility after federal agents seized a laptop he used to access child pornography. 
 
 The closure on Sept. 6 sparked international attention since authorities refused to release any details, while news outlets and conspiracy theorists filled in the blanks with rumors of geomagnetic storms, alien sightings and apocalyptic asteroids. 
 
 According to a search warrant filed in U.S. District Court in Las Cruces, the FBI began investigating after a wireless signal at the observatory, located on Sacramento Peak in the Lincoln National Forest, accessed child porn multiple times since January. 
 
 During an interview on Aug. 21, the facility’s chief observer told agents he had found a running laptop with child porn on it in an empty office several months before. 
 
 Agents say the chief observer believed the laptop belonged to a research student and didn’t report it at the time because he was “distracted by an urgent matter within the facility.” 
 
 The chief observer told agents that only one person had access to the facility around the time of the child porn being accessed: a janitor who started working at the facility a year ago and cleans for a couple of hours a day. The janitor’s parents own the janitorial contract for the observatory. 
 
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 Agents say the janitor has a key and “unlimited access” to the building. 
 
 According to the search warrant, agents seized the laptop. 
 
 Agents say that when the janitor returned the next morning, unaware of the seizure, he claimed to be “missing some cleaning supplies” and asked if anyone had been in the office. 
 
 The chief observer told agents the janitor began complaining about “lax security” at the facility and claimed someone was breaking into the facility at night to steal internet service and toilet paper. 
 
 As time went on, agents say the janitor’s actions grew increasingly “frantic” and he continually approached the chief observer with questions and comments about missing items. 
 
 “(The janitor) had continued to look feverishly through the facility and continued to make comments about the lax security,” an agent wrote in the search warrant. 
 
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 Agents say the janitor mentioned that decoy security cameras “were a joke” and it was only “a matter of time” until the facility “got hit.” 
 
 The agencies that oversee the observatory, National Science Foundation, National Solar Observatory and Association of Universities for Research in Astronomy, decided to evacuate and close the facility after the janitor spoke of a serial killer in the area and was fearful that the killer might “enter the facility and execute someone.” 
 
 While authorities maintain their silence, the observatory reopened Monday. 
 
 “Sunspot is now open, and we’re ready to show you all the great science and public outreach we do at this fantastic facility!” says a statement on the facility’s website. 

 A federal search warrant reveals that Sunspot Solar Observatory was shut down as FBI agents conducted computer forensic searches for child pornography. 
 
 The source of child pornography was traced to an IP address used at the observatory and a source within the building observed a computer with "not good" images on it, the warrant states. 
 
 An investigation by the FBI revealed that a janitor is the main suspect in the search, however he has not been charged with a crime even though his name is on the warrant. 
 
 The warrant states the suspect would use the observatory Wifi and a personal laptop to download the child pornography. 
 
 A limited number of people have access to the observatory from dusk until dawn, which helped narrow their search. 
 
 The observatory in the mountains of southern New Mexico had been closed since Sept. 6 because of an undisclosed security concern, but reopened on Monday.
– After the Sunspot Solar Observatory in New Mexico mysteriously closed for 11 days, citing unspecified "security concerns," rumors of alien sightings or other strange cosmic goings-on proliferated. But the real reason was apparently the disturbing behavior of an Earthling janitor, reports the Albuquerque Journal. According to a federal search warrant, the facility in the mountains of Lincoln National Forest was shut down during an FBI child pornography investigation. They began investigating the facility after the observatory's WiFi was used to send and receive child porn and a worker at the facility found a laptop with "not good" images on it, KTSM reports. Court documents state that after the facility's chief observer told agents that the only person who could access the observatory during the hours that the child porn was downloaded was a janitor, the FBI seized a laptop. The documents state that when he discovered that the laptop was gone, the janitor "feverishly" searched the facility for it and warned the observer that somebody had been breaking in to steal Internet service. The Journal reports that the FBI closed the observatory for security reasons after the janitor warned the observer that a serial killer might "enter the facility and execute someone." The observatory reopened Monday after Association of Universities for Research in Astronomy announced there was no longer a threat to staff.