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(KSL News) -- A trailer carrying an explosive chemical came unhooked from a big rig today in Wellington.
The Utah Highway Patrol closed a half-mile stretch of US Highway Six and ordered evacuations as a precaution.
The semi was turning out of a gas station when the trailer somehow separated from the truck, leaving the vehicle in the middle of the highway.
The semi was carrying ammonium nitrate, a chemical used to make rocket fuel.
UHP says that section of freeway will be closed for four hours.
