In Northern California, three students were injured Tuesday when a teacher trained in the use of firearms accidentally fired a bullet from his gun in a classroom at Seaside High School, near Monterey. Dennis Alexander—who also serves as a city councilmember and a reserve police officer—was teaching a lesson on gun safety when his pistol discharged. The bullet struck the classroom’s ceiling, ejecting shrapnel that lodged in a 17-year-old’s neck; two other students were injured by falling debris. The incident came as President Trump and the NRA are pushing to arm teachers and school staff nationwide in the wake of the Parkland high school massacre.