Officials say a western Pennsylvania high school where 21 students and a security guard were stabbed or slashed by a student is no longer being treated as a crime scene and will likely reopen Monday.

Murrsysville police Chief Thomas Seefeld and Superintendent Gennaro Piraino (pih-RAH'-no) announced those developments at a pre-dawn media briefing outside Franklin Regional High School on Thursday.

Seefeld said the "crime scene was quite bloody with clothes and personal belongings." But investigators have finished processing it, meaning the school district can hire a company that the superintendent says will "clean and restore our building to pre-incident condition." Piraino also said, "We're looking to have students back in our building Monday."

Sixteen-year-old Alex Hribal has been charged as an adult with attempted homicide and aggravated assault in the attacks.