SANTA FE, Tex. — A nation plagued by a wrenching loop of mass school shootings watched the latest horror play out in this small Southeast Texas town Friday morning, as a young man armed with a shotgun and a .38 revolver smuggled under his coat opened fire on his high school campus, killing 10 people, many of them his fellow students, and wounding 10 more, the authorities said.
By the end of the day, a 17-year-old suspect, Dimitrios Pagourtzis — an introvert who had given off few warning signs — had surrendered and been taken into custody. Law enforcement officials said they found two homemade explosive devices left at the school during the rampage.
It was the worst school shooting since the February assault on Marjory Stoneman Douglas High School in Parkland, Fla., where a young man with an AR-15 rifle left 17 people dead and prompted a wave of nationwide, student-led protests calling on lawmakers to tighten gun laws.