FARMINGTON, Utah —  An investigation into naked photos exchanged by cell phone among a group of junior high students has expanded to include at least 28 cases.

The Davis County Attorney's Office is looking into cases at five junior high schools and three high schools.

The case originated from a report from a parent of a Farmington Junior High student that kids there were exchanging naked pictures.

County Attorney Troy Rawlings says even if it's consensual, such pictures are legally child pornography. He says one student told him "everybody with a cell phone" is doing it.