PHOENIX - From a fiery crash involving a semi-truck and light rail train, to Charlie Kirk's murder sparking social media consumption concerns, here's a look at some of your top headlines for the morning of September 15.

What we know:

A tractor trailer and a light rail train caught fire after colliding in Phoenix on Sunday night.

The driver of the tractor-trailer was taken to the hospital with non-life-threatening injuries, while the passengers of the light rail were safely evacuated.

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What we know:

Mental health experts are sounding the alarm on the psychological toll from repeatedly viewing graphic online content, such as the widely shared video of Charlie Kirk's assassination, as young people are particularly vulnerable to this trauma.

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3. Mesa homicide

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