A janitor at Center Area Middle School in Pittsburgh, Pennsylvania has been arrested for making his own child pornography using a peephole in the girl's bathroom.

Janitor Phillip Winkle installed a camera to record 600 video images of girls and women using the toilet, and has pleaded guilty in U.S. District Court to child porn charges.

According to the Pittsburgh Post-Gazette, Mr. Winkle drilled a hole through the wall that separated the storage room from a girls' bathroom in an isolated part of the school's lower level. The bathroom served a small number of classrooms and tended to be used by both staff and students.

Assistant U.S. Attorney Stephen Kaufman tells the paper that from July 2005 until February, he made 131 recordings of female faculty and another 40 of girls using the toilet.