"FILE - This Nov. 14, 2019 file photo shows students being escorted out of Saugus High School after a shooting on the campus in Santa Clarita, Calif. Authorities say 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 Villanueva told media outlets Thursday, Nov. 21, 2019 that Nathaniel Tennosuke Berhow's semi-automatic handgun had been assembled and did not have a serial number. Authorities are still working to determine how Berhow got the handgun. Berhow died from a self-inflicted gunshot wound after the shooting. (AP Photo/Marcio Jose Sanchez, File)"
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