UPDATE:

A pedestrian was killed after being hit by a truck.

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I-90 westbound between Airport exit and Belgrade exit is closed while Gallatin County Sheriff’s Office and Montana Highway Patrol investigate a serious-injury crash.

Investigators estimate that I-90 Westbound will be closed for three hours. Please use alternate routes.

According to the MHP website, the incident was fatal.

The incident is still under investigation. This story will be updated as more information becomes available.