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A tour bus company with a coach involved in a fatal crash in late December can no longer operate in the United States.
The U-S Department of Transportation has ordered Mi Joo Tour and Travel to cease U-S operations.
In a release, the Department says it has conducted an investigation into the company's compliance with U-S safety regulations, including record keeping of drivers' hours.
It says that investigation revealed that Mi Joo failed to take basic measures to make sure drivers were properly rested.
It says on December 30th, the company allowed a driver to drive after having been on duty for well beyond the 70 hours maximum permitted under federal regulations.
That driver's bus crashed, killing nine peopele, and injuring 39 others.