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A motorcycle rider was killed late Thursday in a collision with a semitractor-trailer outside of Green River, according to the Utah Highway Patrol.

GREEN RIVER — A motorcycle rider was killed late Thursday in a collision with a semitractor-trailer outside of Green River, according to the Utah Highway Patrol.

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About 10:45 p.m., a motorcyclist crossed the center line on U.S. 6 and hit a semi head-on, according to a statement from the UHP.

"Alcohol, prescription drugs and windy weather are all possible factors in the crash. The collision and a subsequent fire (destroying the semi and its cargo) caused a complete closure of travel on U.S. 6 (both eastbound and westbound directions) for approximately four hours," the UHP stated.

The victim's name was not immediately released.

This story will be updated as additional information becomes available.