Kjersten Forseth says alternate transportation was being sought Saturday for an unknown number of stranded passengers. She says the company serves Montana and North Dakota and typically has about 100 passengers on any given day on its 13 buses.
One of the company's buses crashed on icy Interstate 90 in Montana in January 2012, killing two people and injuring more than 30 others.
Forseth says U.S. Department of Transportation's Federal Motor Carrier Safety Administration ordered the company to stop hauling passengers late Friday following an inspection at the company's headquarters in Billings.
She didn't have details concerning reasons for the shutdown and the federal agency's website didn't list the company Saturday.