1. “I was thinking it was going to happen eventually, it’s been happening everywhere.”

That was Paige Curry, a student at Santa Fe High School in Texas, after a fellow student killed 10 people with a shotgun and a .38 revolver.

Gov. Greg Abbott said the gunman, identified as Dimitrios Pagourtzis, 17, appeared to have obtained the weapons from his father, who legally owned them.

Investigators are still trying to determine a motive, but the social media trail Mr. Pagourtzis left shows a young man obsessed with violence. Explosive devices were also found on the campus and nearby. Here’s the latest.