"In August, they began speaking to the chief observer at Sunspot, who said he found a laptop running in several empty offices over the last few months.<p>He told the feds what he found on the desktop was "not good," and that it appeared to be child porn.<p>The search warrant states the feds then monitored all the IP addresses and found the exact time child porn was being sent out.<p>It matched only one employee: a janitor.<p>Once that janitor realized his computer was no longer there, the director says he "feverishly started looking through the facility," started making comments about "lax security at the facility," said it was "only a matter of time before the facility got hit, and he "believed there was a serial killer in the area" and that killer might enter the facility and execute someone.<p>The director says that's when he became concerned for his personal safety, and along with the agencies that operate the facility decided to evaluate it and shut it down. "
That's strangely pedestrian, though if you didn't know who was the suspect, I suppose closing down the entire place is the best course of action to prevent tampering.