The gunman’s ‘militancy and excitement’ increased as Australian far-right groups grew bolder, a new book suggests Terrified children hid in the corners of their classrooms at the Islamic Center of San Diego , as they had been trained to do, after the shooting began. The center’s longtime security guard, Amin Abdullah, prevented two teenage gunmen from entering the building and reaching the school inside but he was shot and killed. The pair killed two others: another staff member and a man whose wife worked in the kindergarten.