Scary news out of Arlington, Texas, today, where an 18-year-old reportedly opened fire at Timberview High School.

According to law enforcement, this was not a random incident.

More:

The Arlington PD has posted information about the suspect in the hopes of tracking him down:

We hope that all who were injured make swift and full recoveries.

Meanwhile, something to keep in mind:

To anyone thinking of politicizing this shooting … don’t.

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Update:

Terrifying footage, purportedly from the fight that preceded the shooting and from the moment shots were fired: