Authorities investigating an alleged sex crime captured in the 2011 Big Bear High School yearbook said Tuesday their work is ongoing, but that charges eventually could be filed.

The high school made headlines last week when a photograph depicting a 17-year-old male student with his hands inside the clothing of a 15-year-old female student at a school dance was published in the yearbook.

Sgt. Jeremiah MacKay of the Big Bear sheriff’s station said Tuesday that although his investigation was not complete, it showed that sexual penetration of a minor had occurred.

It would be up to the San Bernardino County district attorney’s office to file charges, MacKay said. The crime could be charged as either a felony or misdemeanor, MacKay said.