How white supremacist mass murders have become an organised transnational security threat.
A heavily-armed student opened fire in Santa Fe High School; the latest mass shooting to devastate the US. The tragedy takes place just three months after the massacre in Parkland, Florida, where a former student killed 17 people.
The attacker, identified by police as a Ohio State University student, drove his car into a group of people before stabbing bystanders with a knife.
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