Teen users of a social media app called Yubo have come forward to report that the perpetrator of the Uvalde school shooting had threatened to commit school shootings, as well as rape on the platform in the weeks leading up to the attack.
It's yet another example of a mass shooting incident linked to the online subculture of violent misogyny called "incel" culture.
For more on how to make sense of this subculture, KCBS Radio news anchor Liz Saint John spoke with an online extremism expert, Caroline Orr Bueno, Postdoctoral Research Associate at the University of Maryland.