GLENN DALE, Md. — Some fifth-graders at Glenn Dale Elementary School in Prince George’s County thought they were going to watch “Star Wars” on DVD, but instead, they got a glimpse of a pornographic movie.

County schools spokesman John White says a music teacher put the “Star Wars” DVD in a laptop Monday morning, but the projector showed a clip from an adult film. The teacher immediately ejected the DVD, but the image of two naked adults remained frozen on the screen for about 10 seconds until the projector was switched off.

A letter was sent to the parents of all fifth-graders at the school.

The teacher wasn’t identified. White says the DVD appears to be a legitimate copy of “Star Wars,” and the school-issued laptop was apparently tampered with.

Investigators don’t believe any students were involved.