“A nation plagued by a nightmarish loop of mass school shootings watched the latest horror play out in this small eastern 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 introverted student who had given off few, if any, 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, which Gov. Greg Abbott of Texas called “one of the most heinous attacks that we’ve ever seen in the history of Texas schools.”

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