The teenager who shot five classmates, killing two, at a Southern California high school used an unregistered “ghost gun,” Los Angeles County Sheriff Alex Villanueva said Thursday. Villanueva told media outlets Thursday that 16-year-old Nathaniel Tennosuke Berhow’s .45 caliber semi-automatic pistol was assembled from gun parts and did not have a serial number. Berhow pulled the gun from his backpack on Nov. 14— his birthday — in an open-air quad at Saugus High School in the Los Angeles suburb of Santa Clarita and in 16 seconds shot five students at random.
