Update 11:30 a.m.
One lane of travel has been reopened westbound on Interstate 94, near milepost 151.
The sheriff's office says that if you are in the area, please continue to use caution, as emergency responders and tow truck operators are still on scene.
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First Report
MILES CITY - A semi rollover crash on Interstate 94 has closed both westbound lanes.
The Custer County Sheriff's Office stated in a social media post that the crash occurred near milepost 151 northeast of Miles City.
The Montana Highway Patrol reports the incident happened on Friday shortly after 9 a.m.
It was not immediately known if anyone was injured in the crash.
The sheriff's office advises travelers to expect delays and asks drivers to exercise extreme caution in the area.
This is a developing story. Check back for updates.