GREENSBURG, Pa. -- The mother of a Greensburg Salem High School teenager involved in an alleged "sexting" scheme is speaking out, saying her son did nothing wrong.

Authorities said three teenage girls allegedly sent nude or semi-nude cell phone pictures of themselves to three male classmates. Those involved are facing charges, and the mother, who asked to have her identity concealed, said she is outraged.

Police said the girls are 14 or 15, and the boys charged with receiving the photos are 16 or 17. None are being identified because most criminal cases in Pennsylvania juvenile courts are not public.

"This is going to ruin his life," the boy's mother said. "My son did not know this girl. He had seen her around school, and it was texted to him. He did not take the picture."

The picture that prompted the arrests of six of the high school's students is of a female student. It was a self portrait in which she appeared completely nude, police said. The photo was discovered in October when a teacher confiscated a student's activated phone in class, which is a school violation.

During the police investigation, other phones with more pictures were seized.

"I could see if my son took the picture of the girl," the boy's mother said. "My son just received this as a text message, which by the way, the principal said the whole school had it on their phones."

The Greensburg Salem School District issued a statement on Tuesday saying there was “no evidence of inappropriate activity on school grounds or during the school day other than the violation of the (school's) electronic devices policy.”

Police said the girls are being charged with manufacturing, disseminating or possessing child pornography while the boys face charges that include sexual abuse of a child.