PHILADELPHIA (CBS) — Three boys are facing charges stemming from a reported sex assault at a West Philadelphia elementary school.

In this case, the victim and the suspects are all fourth graders.   The suspects are 10 and 11 years old.  The alleged victim is an eight-year-old boy who is a grade ahead of others his age.

Capt. John Darby, with the Philadelphia Police Department’s special victims unit,  says the boy was allegedly attacked in a bathroom at Bryant Elementary School in West Philadelphia (see related story).

“An eight-year-old disclosed to his mother on November 5th that that incident had occurred in a prior period, on October 24th of this year,” Darby told reporters today. He said that after investigators spoke with all four boys, the district attorney’s office determined there was enough evidence to file charges.

Those charges include attempted rape, unlawful restraint, unlawful contact with a minor, false imprisonment, conspiracy, and related offenses.

The alleged assailants were being held at a juvenile facility on Tuesday pending a hearing.

A call to the school district was not immediately returned. The boys’ names were not released.

Reported by Suzanne Monaghan, KYW Newsradio 1060