Authorities say they believe two teenagers arrested on conspiracy and other charges after a trespassing incident at Westmont Hilltop, may have been planning a shooting at the school. A 17-year-old and a 16-year-old were charged in Cambria County with conspiracy to commit terrorism and aggravated assault. The older teen is also charged with attempted aggravated assault and the younger with conspiracy to commit criminal trespass and a firearms count. Chief Donald Hess of the Upper Yoder Township police department said five weapons were seized at the home of the younger teen — one pump-action rifle and four AR-15-style semi-automatic rifles that were untraceable “ghost guns” not made by a manufacturer and without serial numbers.