WATCH: Horrifying video captures the moment four teens were killed when their pickup truck flew off a bridge and slammed into a parked freight train after a high-speed chase in Chicago. Police say officers attempted to stop the truck after receiving reports that someone inside had pointed a gun at another driver. The driver sped away, lost control, and launched the vehicle into the train yard below. The four victims, ranging in age from 14 to 19, all died from their injuries. Authorities are con

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