A 17-year-old boy has been charged as an adult by the San Mateo County District Attorney’s Office for allegedly bringing a sword, a chainsaw and 10 homemade pipe bombs onto the Hillsdale High School campus on Monday, an assistant district attorney said today. The district attorney’s office filed eight felony charges against Alexander Robert Youshock this morning. He is scheduled to be arraigned at 1:30 p.m. today in San Mateo County Superior Court, according to Assistant District Attorney Karen Guidotti, who is prosecuting the case. Youshock is charged with two counts of attempted murder, two counts of exploding a destructive device with intent to commit murder, one count of possession of a destructive device in a public place, one count of use of explosives in an act of terrorism, and two counts of possession of a deadly weapon, Guidotti said. The charges could land Youshock in prison for the rest of his life if convicted, she said. Youshock entered the campus Monday morning and detonated two pipe bombs in an empty hallway shortly after 8 a.m. He was arrested after being tackled by a teacher. No one was injured in the incident, which has attracted national attention.