A former NASA employee was arrested under federal child pornography charges Thursday evening, authorities said.

According to NASA investigators and the FBI, Donald Lawson, 70, of Titusville, downloaded hundreds of pictures and videos of children engaged in sex acts, and that Lawson secretly recorded children in the nude.

NASA fired Lawson in late May after nearly 30 years at the Kennedy Space Center for multiple security violations, according to a federal criminal complaint.

Investigators obtained a warrant to search Lawson's electronic devices, which included media storage devices.

According to the complaint, Lawson admitted to downloading "600 to 800 images and videos" of child pornography, and federal agents believe Lawson set up a hidden camera at his house and a hotel room to record young boys naked.

The document said hidden cameras recorded "nude images of the young boys that were in his care, including at least one young boy that Lawson interacted with as a volunteer for a well-known youth outreach program."

Lawson was booked into the Seminole County Jail without bail.