Items seized from a Denver area doctor facing multiple child pornography charges included a “spy pen camera,” according to a federal grand jury indictment.

Dr. Justin Neisler is charged with production of child pornography, transportation of child pornography and possession of child pornography, according to a U.S. Attorney Office, District of Colorado, news release.

A federal grand jury in Denver returned an eight-count indictment against him on Thursday.

Neisler, who was arrested by FBI agents on March 13 on suspicion of transportation of child pornography, is being held without bond.

At the time of his arrest, Neisler practiced at St. Anthony North Family Medicine – 84th clinic in Westminster. Neisler allegedly repeatedly posted child porn to Tumblr accounts. He “admitted to surreptitiously” videotaping naked boys, as young as age 11, during physical exams, according to a court document.

Property seized from Neisler, as part of the investigation, also includes a laptop computer, a cell phone, an external hard drive and a digital hard drive.

Neisler has been affiliated with Centura Health and HealthONE in Colorado and Georgia since 2016, Friday’s news release stated. An investigation of Neisler is ongoing.