From the article:
Reading Police were notified by school officials that a former high school student reportedly showed up on school grounds on March 29 carrying what appeared to be a hand gun. After a subsequent investigation, the gun was located and turned out to be a replica air soft gun of a real Sig Sauer hand gun.
The 17-year-old Reading youth was arrested and charged with carrying a dangerous weapon on school grounds, possession of an air soft pistol under 18, threatening to commit a crime, trespassing, intimidation of a witness, possession of alcohol and possession of a class c substance.
Every gun in the hands of a child must first pass through the hands of an adult.